As noted in the official Apple support page, the Repair Assistant is limited to the iPhone 15+, iPad Pro (M4) and iPad Air (M2), which still leaves many devices unable to make use of this feature.

It’s not just the iPad Pro that might not work properly after being repaired because of Apple’s serialization efforts. A repair expert has discovered that the MacBook Pro 2021 and 2022 may ...

If your iPhone does need service, Apple will “verify” that it’s eligible for service. You have a number of options for completing the repair, including: ...