Unable to send push notifications

Hi Nico,

unfortunately i am not able to send out push notifications. ??

I was able to register different users on different chrome clients – desktop and mobile, but I get a error-message on MS Edge, no error-message on Firefox (even the bell turns active), but no visible registration at the backend.

When I try to send out a notification the process lasts for about 6 minutes, gives then a success-message, but no one recieves a message.

Any suggestions? (I have to mention, that I have to whitelist any connections from my webserver separately – so *.googleapis.com is actually whitelistet, do you use any other connections for your plugin?)