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KLOGIT EngineersFlag for United States of America

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Enable UM for User

Enabled TLS 1.2 over 2 months ago and have setup many users since then, but now we cannot enable UM for a user. I only mention TLS because that is what forums say is the cause.

Here is the error

Unified Messaging can't validate or generate a UM PIN for mailbox 'user@domainname.com' : An error occurred while accessing the user's mailbox. Details: The underlying connection was closed: An unexpected error occurred on a send.
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Amit
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I would advise you to revert the change and check again. Better to open case with Microsoft.
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Saif Shaikh
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In the end I was missing a TLS 1.0 Reg entry. I re-followed this link and created new reg files.

https://techcommunity.microsoft.com/t5/exchange-team-blog/exchange-server-tls-guidance-part-2-enabling-tls-1-2-and/ba-p/607761