Yes, as of just a few days ago, the Powerwall Manager app is not working due to a change in the way Tesla is performing authentication. As part of Tesla's authentication flow, I believe I need access to the headers of an HTTP Post 302 redirect response itself rather than follow the redirect, and I can't find a way in Hubitat to perform that function.
If I'm understanding this correctly, the issue has been encountered before, but so far I haven't seen that there's been a response yet from @chuck.schwer on whether this might be a candidate for an enhancement update.
Hopefully, I'm just missing something, but otherwise, without an update from Hubitat, we may be dead in the water with getting this working again with the new Tesla authorization service.