Up until recently we have been happily using Azure AD MFA, with a mixture of users using the app, and some electing to receive a voice call. At some stage recently, calls to NZ land lines stopped working. People using mobile phones are still receiving the verification call, but those using Vodafone and Spark land lines do not get called. Our telco does not see any incoming calls from the source phone number, and is pushing back saying the problem is at Microsoft's end, which my feeling is that it's probably the case.
What do you guys reckon has happened?
