Open this link and make sure you see "You are a tester"
(this step is required — don't skip it):
https://play.google.com/store/apps/details?id=com.dotcheck.app
Only after seeing "You are a tester," open the Play Store app and
search for "DotCheck" (or install it directly from that same page).
If you get "Item not found" at step 2, wait a few minutes and try again
— it can take Google's system a little time to register you as a tester after joining the group.
Website: https://dotcheck.ai
Thank you!