IOS App will not sync to VW Server

Hey together,

a few weeks ago, my cellphone updated the iPhone App “Bitwarden”.
Two days later I recogniced that the app don’t sync anymore the database.

Nothing works:
-deleting the App data and Bitwarden App
-reinstall iPhone Bitwarden app

I can access vaultwarden via safari, so there is no firewall problem.

All the other clients (iphones, laptops) have no problems to sync

I have the vaultwarden version 2023.5.0

Is there a solution?

Thanx everyone