Philips TV integration hangs - Please wait while the integration is being installed

I’m trying to add a Philips TV integration via the HA webinterface.

After selecting the Philips TV in the menu, a pop up appears stating

“Please wait while the integration is being installed”

The pop up just keeps hanging and HA doesn’t succeed in adding the TV integration.

Any hints on how I can debug this situation?

BTW, I’ve successfully added other integrations so the basics of the setup appear to be working fine.