Voicemail not working in CUPC

[ryan_bender]

Everyone has CUPC 8.6 installed with CUPS 8.5, CUC 8.5 and CUCM 8.5 servers.  Anyone who logs into CUPC are unable to listen to their voicemail through it.  Show server health gives "VoiceMail Error. The server has rejected the provided credentials. [1903]", but we're positive the credentials are correct under Account Options.  Passwords have been reset just in case with no luck.  We recently created some OU's in AD to apply some GPO's and have moved most of our users into those.  The Cisco service accounts we created have been left in the original Users container.  LDAP User Search Base used to point directly to the Users container in AD but has been change to root for both CUCM and CUC.  Search Context under LDAP Profile Configuration in CUPS has been changed to root as well.  The LDAP Manager Distinguished Name accounts haven't been moved from their AD container for CUCM or CUC, and Bind Distinguished Name (DN) account in CUPS has been left alone as well.  I'm not quite sure where else to look.  Any insight would be greatly appreciated.

[Dennis Mink]

Are you allowing IMAP access into CUC?   you set this in the "Voicemail Users" Class of Service on CUC, so it will apply for all users once the COS is changed. 

Also you might want to set the Credentials source for voicemail service, on CUPS     to    "CUP"