Reconnect primary appstore account for testflight

We are releasing a new version of our application and wanted to test via testflight.

However, our iPads are all setup with the same appstore connection email account.

Of late, a click was made on the button "stop testing" for our app and I cannot find a way to reinstate testing on those iPads.

I have tried removing the email from the "App Store Connect Users" group and putting it back in, but I did not get the opportunity to resend an invite.

What can be done to resolve this, please ?

Best regards

Simon

Reconnect primary appstore account for testflight
 
 
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