I've been getting this error when opening TestFlight since this morning. I tried restarting the network, re-install testflight, updating my iPhone, and re-logging with my Apple ID.
This error prevents me from installing or updating all apps linked to my account, so I don't think it's related to a particular app permission.
Well, I solved it (or it solved itself while I tried things).
This is what I tried:
- Removed apple id from iPhone (from the web)
- Add the apple id to the iPhone (from the iPhone)
- Uninstalled testflight
- Restart the iPhone
- Installed testfligh on my mac
- You can see all apps you have tested (WHY IS THIS NOT SHOWN ON MOBILE NOR ON THE WEB??????????!)
- Removed the apps I'm not currently testing from the mac testflight
- Reinstalled Testflight on the iPhone
- Open Testflight, it worked...