Do you have a subscription to Ubisoft+ by any chance? Because during the free trial month my library was all over the place just like you describe. The Ubisoft integration seems to be unable to deal with owned games and a Ubisoft+ subscription simultaneously.

It showed all 120+ Ubisoft games under "Subscriptions" (which makes sense), but under "Ubisoft Connect" it showed only 5 or 6 of the 22 games I actually own. As soon as the trial month was over and my subscription cancelled, everything was back to normal.

Yeah I noticed that too. I also used the trial and after it expired my games showed up again so that must have been the issue.

ok, I'm a bit of a noob with this sort of stuff what do I need to do with the the url? am I supposed to copy and paste it somewhere?

This is literally the solution given on the first page of this thread, like the 5th comment.

Once you get the appID and gnomeID from the Ubisoft login page do the following:

Go to:

%LOCALAPPDATA%\GOG.com\Galaxy\plugins\installed\uplay_afb5a69c-b2ee-4d58-b916-f4cd75d4999a\

Open consts.py using Notepad or your preferred text editor

Replace line 15 with CLUB_APPID = "Whatever you got from the Ubisoft login screen"

Replace line 16 with: CLUB_GENOME_ID = "Whatever you got from the Ubisoft login screen"

Save file.

Make sure the numbers are in quotations as well.

I don't see any such files named that in my directory

where do I find this url? I cant see it

Edit: I have done it but its not working for me
Here is what I have done

Solution above (Changing line 15 in consts.py) isn't working for me either.
I cannot connect, plugin has crashed, retry.

All plugins work for me, except Ubisoft since launch of GOG 2.0 is giving me trouble.

I had the problem, that the plugin kept logging off.
So i suggest, close GOG, delete the Ubisoft folder. Run GOG and see if it does as for me. It tried to log in and log off. Then i tried the steps described up and now it connected without even asking again or popup. If it will not work i can try to make screenshots to explain better

can you please give us more detailed solution? Thx

This solved the issue, thanks!

Thanks, this worked well on my side too.

But I don't understand, the bug dates from February 2022, we are at the end of October 2022, and it is still not fixed ? How is it possible?

Apparently because the code maintainer is no longer active and the official git repo, where Galaxy grabs the code from, can't be modified.