Are the app icons grayed out on your Android device?

The reason for this could be that your administrator has deployed a passcode policy to your device through GoTo Resolve MDM, but your device is not meeting the passcode requirements. If this is the case, you should see the round GoTo Resolve MDM icon on the device's notification area. When you open it, you will see a password change request from GoTo Resolve MDM. In case you don't see the notification, go to the device's settings and define a new lock screen passcode.

Specify the lock screen passcode. After that, you should be able to use your apps normally again.

It is a good practice to use a long passcode that doesn't have many repeating or consecutive digits.