We have been using Cisco Unity Connections for a long time and have had it integrated with Office 365 for voicemail notifications. We got reports that when someone was left a voicemail, their phone would reflect that there was a voicemail, but no notification was getting to the users Office 365 Inbox.

After a little digging we discovered that the “Client Secret” from M365 had expired for the Enterprise Application. The solution was to create a new client secret and update that in Cisco Unity Connections.

Use that copied value in Unity Connections