Posted March 12, 2023
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"Heres the fix for this issue:
Open the Python file "%LOCALAPPDATA%\GOG.com\Galaxy\plugins\installed\uplay_afb5a69c-b2ee-4d58-b916-f4cd75d4999a\consts.py" in a text editor.
Change line 15 [a]nd 16 to:
CLUB_APPID = "314d4fef-e568-454a-ae06-43e3bece12a6"
CLUB_GENOME_ID = "85c31714-0941-4876-a18d-2c7e9dce8d40"
Save, connect (no need to restart Galaxy), stay connected :)
Ubisoft changed the server ID, the plugin had the old values, therefore no connection. Simply change both id's to the values above.
EDIT: If it still doesn't work or is disconnecting after some time, go to the Ubisoft website and log in; it should open a new window to enter your username and password. When double-clicked, the URL of the login window will have the IDs listed above."
Note that one commenter said that it's at %appdata%\local instead and I haven't tested it myself, so idk on that part.