Addons not working for new external domain

Configuration
1

Hey,
I changed the domain from which I access home assistant externally. Since then I can’t access the addons from the sidebar anymore, but receive a “xxxDomainxxx has refused the connection.” error. The addons are still working and running, as I can access them if they are exposed on another port or via the internal home assistant host IP.

Everything else works fine after the domain change. I changed the domain under Settings>System>Network>Home Assistant URL.

I am using the home assistant OS.
Versions:
Home Assistant 2022.9.6
Supervisor 2022.09.1
Operating System 9.0
Frontend 20220907.2 - latest

Any help would be appreciated. Thanks!

Best, Felix

2

Found the mistake. It was an error in my security headers. Specifically, the Content-Security-Policy header. Fixed it and now it is working again.