Whatsapp Desktop not logging in

Hey friends,

Since many months, my Whatsapp Desktop (also Whatsapp Web) does not work anymore. That is quite frustrating.

I scan the QR code, then it says "Loading your chats" (see screenshot). It loads around 2 minutes, then it says "logging out" and that's it.

Did anyone have similar issues? How did you solve them? Obviously, I tried the uninstalling and reinstalling them. I have a Mac, as well as an iMac, same issue on both Macs. Also on Whatsapp Desktop.

PLEASE help me :-)