Related to this closed issue (#69) from a little over a year ago, we have this same problem when trying to use any @xboxtest.com accounts to sign in using XblDevAccount.exe
We get the following error:
Error: signin failed
Response status code does not indicate success: 403 (Forbidden).
We can use XblDevAccount to signin with our main accounts we use to access partner center, but not with the testing accounts. We have made sure to switch to the sandbox where the @xboxtest.com accounts have permission. Is there a special tenant or options that would allow signing in with an @xboxtest.com account?
Thanks in advance!