We've been experiencing a problem where and extension will be removed from the Subscriber sheet on Unity, but when we try and add it back, it says the extension is already has a mailbox. We've deleted the mailbox and recreated and the problem continues. We've gone as far as removing the Phone and the User from Call Manager, and Deleting the Subscriber from Unity, then starting over. Still the same result.
And run it against your system. It should check for rows in that table that don't have proper "parents" - it wont clean them out for you automatically but it'll tell us if that's the problem and we can go from there.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.