No Mail Notification

Hello,

I have configured mail notifications on my Apple Watch only for one of my three accounts, but I never receive any notification. I do see the notification on the lock screen of my iPhone, but not on my Apple watch.

If change the settings to receive notification for all accounts (default settings), I'm still not receiving any notification.

This was working with previous WatchOS releases, but suddenly stopped with the upgrade to watchOS 5.

How can I fix this?