Exchange 2016 Unified Messaging issue... RRS feed

  • Question

  • Unified Messaging can't validate or generate a UM PIN for mailbox 'mailbox@domain.com' : An error occurred
    while accessing the user's mailbox. Details: The underlying connection was closed: An unexpected error occurred on a

    This issue started recently not exactly sure when. We are running Exchange 2016 CU18

    I cannot view the UM details for any UM enabled user in EAC. I also cannot enable or disable UM for any user.

    Monday, December 7, 2020 8:36 PM

All replies

  • forum migrated to mentioned below forum 


    please mark as answer if issue resolved

    Monday, December 7, 2020 8:47 PM
  • Did you move my question to another forum? The link you list doesn't have my question in it...
    Monday, December 7, 2020 9:36 PM
  • Hi,

    All Exchange server forums (except for the "development" have been migrated to the new Microsoft Q&A platform, unfortunately the question cannot be moved to the other platform, you will have to create a new question in the dedicated Exchange Administration forum over here: 

    (Please don't forget to mark helpful replies as answer, thank you)

    Best regards,

    Blog: https://thesystemcenterblog.com LinkedIn:

    Monday, December 7, 2020 9:57 PM