I need redeem code invitation for TestFlight please

That's not how TestFlight works.

TestFlight enables developers to install beta versions of their application for testing purposes.

While you can download and install the TestFlight app from Apple, you need to reach out to the app developer to get a code to enable and download a specific application for testing.

The developer sends you a code, you enter that code into TestFlight and away you go. No one here can get you that code.

I think I've answered this same question about three or four times in the last couple of days. Weird.