M365 - MFA - Activation failed - How to fix

[Alastairb25]

Hi All,

 

We find we get this error for some users :-

 

Activation failed. Make sure that push notifications are enabled on the phone and your Activation Code is not wrong, expired or formerly used.

 

Tried :-

Disabling MFA

Reseting MFA

Checked User not in Admin group

 

User was "Risky" in Azure, but acknowledged this

 

Everytime we scan code get this error

 

Anyone had this/know of a fix?

 

 

TIA,

Alastair

[TechMonkey]

Blocked MFA?

 

Check this pane https://entra.microsoft.com/#view/Microsoft_AAD_IAM/MultifactorAuthenticationMenuBlade/~/BlockedUsers/fromProviders~/false/fromNav/

[dazthorp]

Is this just happening today? I know schools Broadband are having some internet issues at my school and it has threw up a couple of MFA activation errors but most likely due to the Internet issues as School IP address whitelisted for MFA onsite and a couple of users been prompted today.

[Alastairb25]

Blocked MFA?

 

Check this pane https://entra.microsoft.com/#view/Microsoft_AAD_IAM/MultifactorAuthenticationMenuBlade/~/BlockedUsers/fromProviders~/false/fromNav/

 

That was it.. thanks

[MatthewL]

One to watch for is time adrift by seconds can cause issues, I had a mobile of a user that wasn't set to use system time, although it looked right it was enough to cause issues, one to keep an eye for with MFA.