Edit: I hadn't realized the 'Answers' subforum was for people seeking general answers, and thought it was a problem presumed answered. Either way, I believe this to be a problem for the SDK Development subforum, and is a showstopper for us:https://forums.oculus.com/developer/discussion/43482/accepting-release-channel-invitation-on-a-test-account#latest
In a nutshell, when you create a test user a subaddressed e-mail is used (which makes sense as you want to prevent multiple users being created).
However, when you go to add users to a release channel you need to accept an e-mail invitation. This invitation goes to the subaddressed e-mail, which does not exist. It is impossible to change e-mails on this subaddressed account. Thus, as far as we can tell, it is impossible to accept this invitation and actually test any release channel from a test account. The fix seems simple to me, just don't require this e-mail sign-off from test accounts. In the meantime, is there any way around this so we can use a Test User (and thus the Test Payment Info) for our IAP?