Testflight only shows redeem code when a new build is published

I am trying to install our latest dev version from Testflight onto our clients phone. The user can't see any screen other than Redeem Code, and there is no code provided in the build email.

What is the best way to move past redeem code screen and get a working staging app on the phone? This user is also the account holder/admin.

Testflight only shows redeem code when a new build is published
 
 
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