Push alerts since many days

Nextcloud 25.0.2 (manged cloud)

Hello, i klicked for testing the push alerts on, that i want to get a notification, if a shared folder is downloaded. It works. But since about 10 days i get this messeage on every startup my Laptops on the Nextcloud Desktop App (Linux Mint 21 Cinnamon).

How can i fix that problem? I klick the alert on every time, but it comes again at new boot of the device.