Did you happen to figure this out? I occasionally need to disconnect associated accounts and can only see whether they are/are not associated from the AdminCP > User > Extras tab but don't have a button to disconnect them so I've been having to manually do it in the database.
Wonder if that would solve my issue (4 years later).
I have a bunch of Discord assocations that I need to remove and have users redo it (cause of new features) but the Disassociate button doens't do anything for my Discord.
Every time I click CONFIRM it just reloads that page and unchecked the Disassociate option.