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can't reinstall microsoft defender on my iphone

I cannot get Microsoft Defender to work on my iphone. I keep going around in circles being asked to chose an account to log in. Something appears to be clashing

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-11-03T16:16:01.17+00:00
Michael Stone 0 Reputation points
1 answer

Microsoft Defender app (Windows 11 26H2): crashes on launch with access violation in OneAuthInterop.dll, no window appears

The Microsoft Defender app on my Windows 11 PC crashes about 2 seconds after every launch. No window ever appears. It started on Oct 5, 2026, after repeated "sign back in" errors in the app the same day. Steps to reproduce: Install Microsoft…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-05T22:18:25.2233333+00:00
Richard Hammers 75 Reputation points
commented 2026-10-23T21:48:57.24+00:00
Jade Hendry 0 Reputation points
1 answer

Policy Changes - Edit protection settings (Anti-phishing)

I am a Global Administrator on a Microsoft 365 account. When I'm trying to change my Ant phishing policy : enabled user impersonation --> add trusted sender --> apply quarantine action --> enabled notification apply notification policy I…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-23T10:53:58.5766667+00:00
sarah B 0 Reputation points
answered 2026-10-23T12:06:26.43+00:00
Vasil Michev 128.6K Reputation points MVP Volunteer Moderator
0 answers

Open SSL Vulnerability libcrypto-3-x64.dll and libssl-3-x64.dll

Experiencing issues with OpenSSL vulnerabilities affecting organization security score. So far, I was not able to find any fix for it, tried updating the programs, doing windows updates even take ownership of the program file and delete manually. but the…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-03-18T16:50:17.11+00:00
alex kalapnauth 30 Reputation points
commented 2026-10-22T05:02:31.72+00:00
tzuki zy 0 Reputation points
2 answers

Defanged malicious URLs in SOC security notification emails still classified as High Confidence Phishing by Defender for Office 365

Hi, SOC security notifications may contain threat-intelligence indicators such as malicious domains, URLs and IP addresses. Throughout my years of using Microsoft email services across different organisations, I have regularly handled similar security…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-07T13:11:07.18+00:00
Mohd Irzani Bin Wahid 0 Reputation points
answered 2026-10-18T22:30:54.0633333+00:00
Rauh, Alexander 330 Reputation points
2 answers

Phishing email sender office365alerts@microsoft.com

One of our employees received a phishing email from this sender office365alerts@microsoft.com with the Subject Line: High-severity alert: tenant compromised . The malicious hyperlink inside the email redirects users to a spoofed UK domain designed to…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-15T12:43:00.5233333+00:00
Reginald StaRosa 0 Reputation points
edited an answer 2026-10-15T16:59:07.32+00:00
Marcin Policht 112.2K Reputation points MVP Volunteer Moderator
1 answer

Windows ONLY allows login using Passcode. Passwords no longer work.

Just, 10/14//26, updated Windows 365 Pro Family plan. I also subscribe to MS Office pro 365. Since immediatly after update & reboot, all my passwords no longer work. Everything only wants passcodes. I have several MS email Accounts, and all are…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-14T23:37:20.9766667+00:00
Norm Johnson 0 Reputation points
answered 2026-10-14T23:38:22.4266667+00:00
Norm Johnson 0 Reputation points
1 answer

Is this a scam?

I have received the email below. Is it a scam? From: E-Mail Sync <thepawpadAToptimum.net> Sent: Monday, October 12, 2026 3:30 PM To: msaATcommunicationDOTcom <msaATcommunicationDOTcom>; msaATcommunicationDOTcom…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-13T21:20:36.4066667+00:00
James Scott 0 Reputation points
edited the question 2026-10-13T22:10:08.37+00:00
Don Varnau 19,940 Reputation points Volunteer Moderator
1 answer

How to fix this issue: Blocked due to organizational overrides. Update or remove the "FileTypePolicy" action from the Anti-malware policy (Strict Preset Security Policy1656932236829)

We are sending an internal email, but the email is bouncing back with the following error: “Blocked by organization policy: Antimalware policy block by file type.” However, the file type is not included in the blocked file types list, as we verified in…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-02T06:22:24.2333333+00:00
Shahnawaz Alam 0 Reputation points
answered 2026-10-05T21:25:27.82+00:00
Rauh, Alexander 330 Reputation points
0 answers

Microsoft Defender for Cloud: URL classification issue causing service access disruption — Urgent investigation needed

Problem description I am experiencing an issue where URLs under my custom domain are being classified as malicious by Microsoft Defender's Safe Links feature, leading to access disruptions for my production service. The URLs work normally outside of…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-01T15:36:47.1366667+00:00
Darren Mizzi 21 Reputation points
1 answer

One of our Development Website has been reported as unsafe

I have filled out the More Information and "Report that this site doesn't contain any phishing threats" for two weeks and the site is still blocked. How do I get this removed? This is impacting our client testing and the first email stated…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-10-01T14:30:56.4566667+00:00
Al Dommes 0 Reputation points
answered 2026-10-01T14:31:10.1133333+00:00

AI answer

1 answer

Phishing emails my network

Hello, How do I avoid some of my teams emails getting compromised phishing emails. What additional security can be added to my companies domain?

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-30T14:17:04.5366667+00:00
DJ McShane 0 Reputation points
answered 2026-09-30T14:17:20.1566667+00:00

AI answer

1 answer One of the answers was accepted by the question author.

Dynamic Rule for Putting Users with same License and Add-On License in the same Security Group

Hi, I have created a dynamic group with this rule: (user.assignedPlans -any ((assignedPlan.servicePlanId -eq "servicePlanId") -and (assignedPlan.capabilityStatus -eq "Enabled"))) This for adding all E3 users in the same group.…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-18T16:48:13.59+00:00
Jorziño Barradas 100 Reputation points
accepted 2026-09-24T13:56:03.4833333+00:00
Jorziño Barradas 100 Reputation points
1 answer One of the answers was accepted by the question author.

Security Intelligence isn't updating

my security intelligence isn't updating. it is stuck in a searching for updates mode. the current version is 1.421.421.0 and last update was 11/22/24. can you please help?

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-19T11:11:28.5266667+00:00
LoG 20 Reputation points
accepted 2026-09-19T19:07:09.5666667+00:00
LoG 20 Reputation points
1 answer One of the answers was accepted by the question author.

How to make sure Defender is working correctly

Microsoft defender always says 'no current threats', and shows 'no recent actions' in the history, even when I run a full scan. I'm concerned it's not working right. I see on-line to guidance to run DISM and then system file checker. Is there an easier…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2025-09-15T21:17:37.61+00:00
EP 20 Reputation points
commented 2026-09-07T21:21:25.5033333+00:00
john hacker 0 Reputation points
1 answer

windows security scan

Hello Windows security when trying to scan quick or full scan it takes very long time and never continue it stuck , as it was not like this but this happened since the two days ago and still . So, please resolve this issue as am sending you the…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-04T23:32:40.16+00:00
asmahan gbara 0 Reputation points
answered 2026-09-05T09:49:52.8866667+00:00
Bence Weiszmann 1,825 Reputation points
0 answers

Received an email in junk folder with header New apps have access to your data

I received this email from this address account-security-noreply@accountprotection.microsoft.co3 It goes on to say "New files connected to the microsoft account **" then a hotmail email that I don't recognize (appears to be first name…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-09-03T12:40:28.1066667+00:00
User1 0 Reputation points
1 answer

Email sending issues post-compromise

Hi there I had my email hacked a few days back and secured the account, but I cannot now get the block lifted - every email I send is met with the same : "Remote server returned '550 5.1.8 Access denied, bad outbound sender AS(42004)'" - but…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-28T12:00:05.63+00:00
Crawford Warnock 0 Reputation points
edited an answer 2026-08-30T20:13:19.51+00:00
Zoha Fatima 675 Reputation points
1 answer

how do i delete old email address that is full of malware

my old email address has changed and its been encrypted with malware and i don't use that email address anymore

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-27T21:54:54.0033333+00:00
Mike Noble 0 Reputation points
answered 2026-08-27T21:55:06.2866667+00:00

AI answer

1 answer

O365 email security

During last couple of years, several of our O365 exchange email accounts got compromised time-to-time even when MFA was enforced. During these email hacking incidents, email users did not receive any unexpected Microsoft security codes on their phone.…

Microsoft Security | Microsoft Defender | Microsoft Defender for Office 365
asked 2026-08-20T21:03:16.2933333+00:00
Dharshan Jinasena 0 Reputation points
answered 2026-08-20T21:03:33.3633333+00:00

AI answer