[deleted] I have the same issue. After the most recent you-have-mail app update, I'm no longer receiving notifications from Proton mail. The reason I went to the YHM app was because I wasn't receiving PM notifications, but the app originally solved this.
I've tried clearing cache and storage on both apps, uninstalling and reinstalling. No luck. I'm relatively new to GOS and still learning as I go (first post here).
I'd love to get PM notifications working again, but not by signing into a Google account. This is on a Pixel 8 Pro.