WebUI from Rocket.Chat. NOT EGroupware.
What you are showing is something between your RC instance and the push gateway of Rocket.Chat. In order to deliver messages there, it must be configured correctly.
Do you need push messages for mobile devices (Rocket.Chat Mobile) in your use case?
For this message / problem, I would take a look at the Rocket.Chat forum. Someone there has certainly already had this “problem”.
This is a place where you will eventually reach the limits of the community version:
Either you then upgrade to a paid version, run your own push gateway or you book this service with a third-party provider.
I don’t know anyone who has asked for this so far. For our customers, that’s fine. You can also have your mobile device pushed…
Do you mean authentication against EGroupware OpenID? That is something completely different.
Does your SSO work?