Webtransport Sample does not work on Firefox 122, Microsoft Edge 121, Opera GX

[ValorZard]

I've tested and tried it a few times. but it just doesnt work.
I've used https://googlechrome.github.io/samples/webtransport/client.html, and it doesnt want to connect.

If it helps, I tried it with a different Webtransport demo (https://webrtc.internaut.com/wc/wtSender12/), and got this errror:

This confuses me, because according to https://caniuse.com/mdn-api_webtransport, webtransport SHOULD be enabled on firefox

EDIT:
After checking my other browsers, it doesn't seem to work there either:
Opera GX:


Microsoft Edge

What's weird is that the internaut demo DOES work on both of them

[nickbetteridge]

Doesn't work for me either, even on Chromium

[markafoltz]

If you believe this to be a bug in Chrome, then to bring it to the attention of Chrome developers file the repro steps at https://crbug.com/new, and assign it to the component Chromium > Blink > Network > WebTransport