FBx day 4: Matrix Synapse's howto

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Seems like my BOSH issue was encountered previously here:

JSXC broken in Freedombox 20.4?

I can’t find any hint how to fix this BOSH problem. Is here anyone who has mod_bosh in ejabberd on port 5443 and tls: true and jsxc still working?! Even if I put tls on false - then I lose http_upload. https:<mydomain>:5443/bosh leads correctly to the test-page of mod_bosh, so the bosh server obviously works. But if I start jsxc and type in the domain field the check outputs a failure BOSH server NOT reachable or misconfigured. 502 Proxy Error Any hint welcome!

From the discussion, it looks like it’s a matter of JSXC’s version, but it doesn’t explain why I can’t reach the server from other clients…

In my situation:

https://mydomain.freedombox.rocks:5443/bosh does not lead anywhere.
The internal server issue persists when I try to connect via other clients.

Is there anything that I can do to connect to the ejabberd server ?