There are three methods for ios internal testing. You don't need to go to the App Store, you don't need to jailbreak, and you can easily install the internal test with corporate signature, super signature or tf signature.

Search for "micro-diversion" and sign it.

When installing an enterprise signature application, you need to trust the mobile phone settings-general-profile and the certificate in device management to successfully install it.

Tf signature installation: first install testflight, and then install the application from testflight.

Tf signature is stable and will never be cancelled. Is the most popular signature method at present.