I've encountered a strange issue where two users have reported problems with Microsoft MFA voice calls not functioning correctly. One user mentioned that while he's not missing any calls, he has received several voicemails, but there are no missed calls showing up. This feels odd, and I'm wondering if it could be related to their cell provider.
2 Answers
I agree with the carrier theory, especially if it seems isolated to certain networks like Verizon. It's worth noting that your organization decided to allow voice calls as a secondary option for users who prefer not to install an app. Have users looked into call filtering settings that some carriers implement?
It sounds like it might be a carrier issue. I'd suggest considering moving away from using voice calls for MFA due to these inconsistencies. Voice call reliability can vary a lot, especially with certain providers.
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