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Error: access_denied


I'm trying to connect a phone via qr code using your guide:
and everything works for you.

write in my application
provider = new XummPkce(xummApiKey);

where xummApiKey i got, after api registration in xumm dev console

and it gives me an error:
Error: access_denied
Invalid client/redirect URL.

Can you please tell me what can I be missing?

also repeated all the steps from here

also I tried other approaches: XummSdkJwt , xApp. And they simply cannot join the server.
scanQr response: xApp.scanQr: could not contact Xumm App Host
POST 500