Couldn't redeem TestFlight invitation code

I cannot add myself as a TestFlight user to my own app. When I open the invite link on my device, or manually enter the redeem code on device (obtained from opening the invite link on macOS), I get "This invitation has been revoked or is invalid".

I've tried going to App Store Connect and removing myself from both the testing group and the list of 'All testers', both to no avail.

Apple folks: this is not user error and you must have thousands of bug reports on this by now. Why don't you prioritize a fix for this incredibly annoying issue?

agree entirely- I see this question all over, and I have yet to find an answer to it anywhere and it has started to cost me a significant amount of time as I am forced to engage in customer service rather than spend valuable time debugging app,and apple doesn't seem to even be willing to publish a specific set of instructions that i can send a link to with the testflight invitation. It gives first time users a terrible first ux and I'm really annoyed that apple seems to be ignoring the problem entirely.

Couldn't redeem TestFlight invitation code
 
 
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