Cannot (re)install GitHub integration

Hello.

I’m trying to connect my GitHub organisation to have better integration with deployment tracking.
When I click on the “+Install” button for Github integration, I see:
image
I cannot proceed.

We are on a Sponsored plan.
The connection did work some days ago, I think, but it seems to not working anymore.
I tried to connect via the marketplace but it’s not working either.

Thank you.