Hello,
I would like to join the testing of your app on TestFlight, but I need an invitation code. Kindly please send me the TestFlight invitation code if possible.
Thank you very much!
[Re-Titled by Moderator]
This is a user-to-user forum. It is not a place to request TestFlight codes.
if it's the app of a third party developer then try How to contact an app developer - Apple Support
if it's an apple app then reach out to their official support channels
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or
And
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Contact - How to Contact Us - Apple
Requesting TestFlight invitation code for app testing
