I believe, the extension is using the API v4 and its pointing to the Suite7 endpoints - not the legacy ones from Suite8?
I’ve tried it as well - but any extension / software that’s using the Suite7 paths in a fixed manner should have stopped working.
However, if it might not be due to the legacy API paths, I’ve tried adding all sorts of fairly insecure exceptions into my vhost. And I’ve tried adding just the code that the extension suggested - but nothing helped with the CORS headers.
Nothing helped