Desktop Client does sync the mails

Since yesterday the desktop client has stopped receiving emails.
The mail.de app on the cell phone (Huawei Android9) and the web client on the laptop (Win10Pro 64bit) still work.
The Samsung Email App on my tablet (Android11) no longer updates the emails either. However, other mail accounts are synchronized via this app.

Click the refresh button at the top left in eM Client. Then click 'Menu / Operations" and click the “Log Tab” at the far right and see if you can see any obvious errors in the log and paste that in this thread below.