Testflight complains about developer certificate being used to sign the app

Question

Suddenly I started getting this from Testflight when uploading a new build of an app:

This build is signed with a Developer certificate, it can only be installed by devices with the Developer feature enabled. We recommend signing with a distribution provisioning profile for best results.

And my users have problems installing the app. I've gone over the project settings again and again, but everything looks right.

I've set the team provisioning profile to be the provisioning profile for both debug and release, I've even changed to a different team, but still the same problem.

Am I looking in the wrong place here?

Answer 1

I just came across this exact same issue. It looks like TestFlight have added a new check and are flagging developer provisioning profiles when they didn't in the past. Take a read of this (posted yesterday):

Testflight article

I've just uploaded a build to test flight using my normal approach to signing (with a developer certificate), ignored the testflight message, and distributed to my test users. Seemed to work OK.