It sounds like the client is using cached settings and not picking up the new changes. Shutting the client completely and then deleting the content of these 2 directories should be sufficient (vs spinning up a new workstation):
C:\Users\[user name]\AppData\Local\Cisco\Unified Communications\Jabber
C:\Users\[user name]\AppData\Roaming\Cisco\Unified Communications\Jabber
I typically just wipe the entire Jabber directories, but just deleting the content of each is fine. If the paths are too much to remember, just go to %appdata% and it'll take you to the 2nd path above within the 'roaming' directory and you can navigate from there.
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