There are three common scenarios:
If you're using an older device running Android 5.1.1, you might find that the Google Play Store is either missing, disabled, or simply won't open. While Google officially ended Play Services support for Lollipop in , you can still manually install or recover the Store to get your device back up and running. Quick Check: Is it just hidden or disabled? how to install google play store on android 5.1.1