Before applying the Post Configurations, check that you have activated correctly:

Shortcut accessibility (if you dont find search "accessibility shortcut")

Settings ==> Accessibility Features or Smart assistance ==> Accessibility ==> Accessibility shortcut ==> Enable and Select features

Settings ==> Accessibility Features or Smart assistance ==> Accessibility ==> Download service ==> Enable

Select Android Version

Find Android Version of Your device:

Find and tap "Settings" ==> Scroll down to the bottomo of the screen ==> Tap "About phone" ==> Find "Android Version"