Unable to sign in to Azure Portal - MFA Failing when Push Notifications enabled / Push Notification Loop

Gareth Coleman 31 Reputation points

Hi everyone,

So firstly I will apologise if this issue has been submitted and answered elsewhere. I did search and whilst I found similar faults they are not the same.

Since the 1st June whenever I go to sign in to the Azure portal (https://portal.azure.com) I get the MFA screen stating it has sent a push notification to my devices but nothing comes through. If I select the 'I cannot use my Authenticator App right now' option and go to enter the TOTP from the app it comes up saying it's invalid and gives you the 500121 error code.

This issue only occurs on the Azure Portal (https://portal.azure.com) and it doesn't matter whether or not I use Normal or InPrivate browsing or if I switch browsers or devices. All the other Microsoft Portals (https://admin.microsft.com, https://portal.office.com, https://endpoint.microsoft.com and the CSP Partner Portal) all work with no problems at all.

I have tried removing all my MFA devices and resubmitting my MFA data as per https://learn.microsoft.com/en-us/answers/questions/963875/error-code-500121-business-central but I get the same issue. The difference though is that only the Azure portal is affected for me.

I have tried using the OTP via SMS and that sends the code correctly and MFA accepts it before looping back round and tries to send another Push Notification again.

If I try and sign in to an account that does not have MFA devices with Push Notifications (so TOTP only) it seems to work fine.

I have submitted a support ticket through the MS365 support team (as I can't log in to Azure to submit a ticket there) and we're not really getting anywhere despite best efforts from all parties. Being the main Azure Admin in the company, this issue is now starting to cause a few problems!

I thought I would post here in case anyone else has seen the issue and found a quick fix for it.

Thanks in advance!!


Microsoft Authenticator
Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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