HTML5 Notifications - 403: the VAPID credentials in the authorization header do not correspond to the credentials used to create the subscriptions

Hi

I have deleted and re-configured the HTML5 Notification component. When trying to trigger a notification i get the following error in the log:

There was an issue sending the notification 403: the VAPID credentials in the authorization header do not correspond to the credentials used to create the subscriptions.

Even with debug logging I get no further details. My homeassistant is running in a container behind cloudflare via a tunnel.

Is there some way i can fix this or any advise on how to debug it further?

Thanks in advance.