An app that allows you to connect to another android and provide assistance (but not Teamviewer)?

Question

Android

There is an Android phone user with very limited skills due to age, just enough to click on a link and click "allow". You need an app that allows you to send him a link so that he clicks on it, he has a remote access server installed, and through it to make the necessary technical support on the phone.

Teamviewer has turned into complete trash, it has become impossible to use it.

What other options work well?