Microsoft Teams Phone: Error Code 401 Fix – Causes & Steps
Error Code 401 in Microsoft Teams Phone points to one thing first: the service did not accept the current authentication context. Engineers often compare this scenario with other documented Microsoft Teams calling and authentication error codes to determine whether the break sits in the user session, the voice configuration layer, or the call routing path. That can come from a stale client session, a user who is not fully voice-enabled, a SIP device challenge that never finishes, or a Direct Routing leg that fails before the call settles. Same number, different layer. Read the layer first, and the repair path… Microsoft Teams Phone: Error Code 401 Fix – Causes & Steps





























