Why can't I grant Accessibility Permission in AirDroid Kids?

For Android 13 devices, you will receive the pop-up below when you try to grant Accessibility Permission (Restricted settings For your security, this setting is currently unavailable.):

To grant Accessibility Permission, you need to first turn on Allow restricted settings for AirDroid Kids

Here is a video about how to do that:

Below are the steps in detail:

1. Tap Learn more at the pop-up window.                         
2. Go to the Settings of the phone.
3. Go to Application > See All XX apps > AirDroid Kids.
4. Tap the " ⋮ " button which is on the upper right corner of the page.
5. Tap Allow restricted settings.

For some Xiaomi devices, the setting it's in a different place:

When you go to the Application > See all XX apps > AirDroid Kids scroll down the page then you can see the "Allow restricted settings" option.

Now you can go back to AirDroid Kids and grant Accessibility Permission as usual.