Test client not working

[dffitch]

I was interested in this as you send an mp3 over talkback which is exactly what I want to do but am having difficulty doing so.
It seems to be broken as I can make a connection once, but it doesn't list any stations or devices, then on a second attempt with same credentials just hangs with "Initializing...
Not connected can't continue! Maybe wrong credentials or captcha or 2FA."

Hope you may be able to help or point me in the right direction. Many thanks