On the server where the Samba4 account provider is installed, this is a tricky one. If restarting the NSDC service doesn’t fix this, you probably need to reinstall samba4 accountprovider and recreate all users.
I have ran into this in the past too: Another AccountProvider_Error_82
A search on the forums gives you several discussions with the error_82 problem: https://community.nethserver.org/search?q=error_82
I hope there is another way of solving this because IMO it is a bit of a bomb under the confidence and stability of NethServer.