For some reason, TestFlight for one account on one Mac is no longer able to accept a TestFlight invitation.
On that Mac, I am logged into iCloud with the relevant Apple ID. In TestFlight, I sent an invite to that Apple ID. I open the email with the invite, click on the link, and I get an alert in TestFlight saying:
Couldn't Load App
Your request couldn't be completed.
Try again.
(OK Button)
If I log out of iCloud with that account and log in with another account (which I also sent the invite too), TestFlight shows the app and I can download it.
I have been doing continuous clean installs on this Mac for testing, and I am reusing that Apple ID. Have I hit some hard limit at Apple for how many times I can login with an Apple ID?
Any suggestions on how I can use that Apple ID with TestFlight?