I’d be inclined to completely uninstall these games and Ubisoft Connect, being sure to remove remnants from %appdata%, %localappdata%, and %programdata% before redownloading and reinstalling and redownloading them to sccount for corrupted files or missing dependencies.

You may also want to try installing a few demos or free to play games, ideally singleplayer, in order to narrow down if this is something specific but shared between these two games or if it applies to everything on Ubisoft’s platform as a whole. I did look and see that they don’t use the same anti-cheat engine.

On the topic of anti-cheat, consider anything that might hook into these applications. For example, RivaTunerStatisticsServer commonly causes problems with competitive games’ anti-cheat.