86,586 questions with Microsoft Security-related tags

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Unable to add domain

Screenshot 2026-09-03 152003 1.png We are trying to add the domain using work or school using Entra ID and encountering below error

Microsoft Security | Microsoft Entra | Microsoft Entra ID
asked 2026-09-05T05:44:49.07+00:00
Doddabasappa K 25 Reputation points
0 answers

Configuration Manager 2603 Error in SMS_SERVICE_CONNECTOR Worker "OfficeCDNWorker"

SMS_SERVICE_CONNECTOR shows an error regarding OfficeCDNWorker. All this started Sep, 1st 2026. Analyzing the OfficeCDNWorker.log shows: [Critical][OfficeCDNWorker][1][System.Security.Authentication.AuthenticationException][0x80131501] The remote…

Microsoft Security | Intune | Configuration Manager | Updates
asked 2026-09-05T05:21:37.14+00:00
Michael Pfister 6 Reputation points
1 answer

Urgent Tenant Recovery – Sole Global Administrator controlled by former external IT provider

Hello, I am the legal representative of a company that owns and controls its verified corporate domain and Microsoft Entra tenant. We have access to the Microsoft Entra environment through our corporate accounts. However, we have discovered that the only…

Microsoft Security | Microsoft Entra | Microsoft Entra ID
asked 2026-09-05T01:46:50.0333333+00:00
Ayoub ABEIS 0 Reputation points
answered 2026-09-05T03:42:23.4766667+00:00
Kien 975 Reputation points Independent Advisor
2 answers

I am unable update my new phone number and not even able get rid of my old number

i have tried many times i am unable to register with my new number but text code is coming to old phone number and not even considering my mail id as default so i need you to update my number to update their is no option in security or anywhere else

Microsoft Security | Microsoft Authenticator
asked 2026-09-03T12:30:54.48+00:00
Priyanka K 0 Reputation points
answered 2026-09-05T03:36:54.8133333+00:00
EmilyS_726 26,535 Reputation points Volunteer Moderator
3 answers

New phone, can't access Authenticator

I bought a new phone and wasn't aware I needed ti backup authenticator. Now apparently authenticator is linked to my old phone to which I have no access. This is a personal account. How can I fix it?

Microsoft Security | Microsoft Authenticator
asked 2026-09-03T16:51:08.1733333+00:00
María Amador Osuna 0 Reputation points
answered 2026-09-05T03:34:08.04+00:00
EmilyS_726 26,535 Reputation points Volunteer Moderator
2 answers

My computer has a microsoft firewall alert and computer is fully locked. Need live Microsoft support

My computer is a Microsoft firewall alert, indicating Microsoft defender found some infected files I need live support, to unlock.

Microsoft Security | Microsoft Defender | Other
asked 2026-09-04T16:20:33.8633333+00:00
Thomas Colbert 0 Reputation points
answered 2026-09-05T03:29:08.8466667+00:00
EmilyS_726 26,535 Reputation points Volunteer Moderator
2 answers

Unable to login to Microsoft account and admin center via SMS MFA

Got Error code 399287 when perform the SMS MFA step, please advise how to proceed the resetting new MFA.

Microsoft Security | Microsoft Entra | Microsoft Entra ID
asked 2026-09-05T00:45:07.2466667+00:00
Jutha Sukto 0 Reputation points
answered 2026-09-05T03:27:38.2433333+00:00
Kristen Tran 1,510 Reputation points Independent Advisor
1 answer

how do I change the recovery email of my account that I don't have the access to anymore?

yeah, unfortunately recently my laptop broke down and that was my only way to access my recovery email. how do I change it without logging into my recovery email?

Microsoft Security | Microsoft Authenticator
asked 2026-09-05T01:32:55.8766667+00:00
Mark Korolev 0 Reputation points
answered 2026-09-05T03:25:02.21+00:00
EmilyS_726 26,535 Reputation points Volunteer Moderator
1 answer

When will Microsoft Authenticator be fixed?

@microsoftsupport It doesn't work. It never sends new notifications. The codes always fail. I'm so tired of having difficulty accessing what I should be able to easily access. Help please!

Microsoft Security | Microsoft Authenticator
asked 2026-09-05T00:56:40.63+00:00
Jennifer Ann Smith 0 Reputation points
answered 2026-09-05T00:56:54.4666667+00:00

AI answer

1 answer

Azure has blocked myphone number for SMS verification due to a “bad reputation” flag

I try to login via SMS because my phone was reset and now I am getting: Error 399287 means Azure has blocked your phone number for SMS verification due to a “bad reputation” flag. How to let the flag be removed?

Microsoft Security | Microsoft Authenticator
asked 2025-10-09T10:28:05.4+00:00
Bob Louwe 5 Reputation points
commented 2026-09-05T00:53:46.1866667+00:00
Jutha Sukto 0 Reputation points
0 answers

Microsoft account recovery

At Easter my account was hacked I had had that account for 10 years had spent my time and hours on to that account the account name is chopster2011 when it was hacked I was very upset but you know I thought that Microsoft could do something about it but…

Microsoft Security | Microsoft Authenticator
asked 2026-09-05T00:51:07.6833333+00:00
Charlie Pearce 0 Reputation points
0 answers

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
1 answer

Unable to Create Azure Support Request for Ransomware Incident - Need Microsoft Security Assistance

Hello Team, We are experiencing a ransomware/security incident in our environment. Our requirement is to engage Microsoft Security/Azure support to perform: Deep Microsoft Defender investigation. Security assessment of affected endpoints and servers. …

Microsoft Security | Microsoft Defender | Microsoft Defender for Cloud
asked 2026-08-31T09:28:01.0333333+00:00
Ranjitha NJ 0 Reputation points
answered 2026-09-04T23:30:08.87+00:00
Chris Hailes 155 Reputation points MVP
0 answers

Microsoft Authenticator MFA Recovery – Lost Access to Authenticator

Unfortunately, my mobile phone is damaged, and I no longer have access to the Microsoft Authenticator app. I also do not have the recovery key or any alternative MFA method available. I need assistance recovering access to my account and…

Microsoft Security | Microsoft Authenticator
asked 2026-09-04T23:20:36.61+00:00
mostafa hussien 0 Reputation points
1 answer

Linked authenticator app not connected

Rockstar Games relies on a linked account with my microsoft authenticator app, but my microsoft account authenticator is not sending me a code, and the one-time password code does not work to get access to my account information with them. Emailing their…

Microsoft Security | Microsoft Authenticator
asked 2026-09-04T22:52:40.25+00:00
Dragonbane 0 Reputation points
answered 2026-09-04T22:52:58.6966667+00:00

AI answer

0 answers

How to regain acces to old otp

I'm using microsoft's authenticator app for my Instagram profiel, I changed my phone to a new one, and now I lost access to my ig profile because it keeps asking for my authenticator app's code, but that code doesn't show on the app on the new phone. I…

Microsoft Security | Microsoft Authenticator
asked 2026-09-04T22:30:44.5733333+00:00
Valentina de la Torre 0 Reputation points
0 answers

Cannot sign into Windows with my Microsoft 365 account (created in godaddy)

My Windows 11 Business PC is successfully joined to my Microsoft Entra tenant. dsregcmd /status shows AzureAdJoined: YES and DeviceAuthStatus: SUCCESS, but I cannot sign into Windows with my Microsoft 365 account. PRT acquisition fails against GoDaddy's…

Microsoft Security | Active Directory Federation Services
asked 2026-09-04T22:03:09.2166667+00:00
Steve Datnow 0 Reputation points
0 answers

Lors de la validation du contact, une page d'erreur apparait après avoir envoyé le code alors que tout est correct

Lors de la validation du contact, une page d'erreur apparait après avoir envoyé le code alors que tout est correct

Microsoft Security | Microsoft Authenticator
asked 2026-09-04T21:22:33.62+00:00
eric giegelmann 0 Reputation points
0 answers

Graph api create custodian 500 unexpected error

I’m encountering another issue with 500 internal server error code with lack of detail.   What fails POST /security/cases/ediscoveryCases/{caseId}/custodians Request body is exactly per the documentation: { "email": "<smtp>"…

Microsoft Security | Microsoft Graph
asked 2026-09-04T20:36:37.4166667+00:00
Oh, Jeongbin 0 Reputation points
edited the question 2026-09-04T20:37:59.7033333+00:00
Oh, Jeongbin 0 Reputation points
0 answers

Microsoft Authenticator stalls on adding personal microsoft account

I removed my Microsoft Authenticator app registration from Security → Advanced security options and tried to re-add it via QR code. The setup gets stuck indefinitely on 'adding account' (app side) / 'continue setting up' (browser side), reproduced on two…

Microsoft Security | Microsoft Authenticator
asked 2026-09-04T19:52:20.14+00:00
Dave Brown 0 Reputation points