I’m one of the many people who experienced a problem with my Android device missing from Device Manager. I had two devices listed, but for some reason, one of them was stubborn. Here is the path I took to troubleshoot this issue.
After reading various reports of this issue, each of these steps were claimed by at least one person to have fixed this problem.
1. Check Setting
The setting was enabled under Settings > More > Security > Device administrators > Android Device Manager.
2. Battery and SIM Pull
I powered off my device and pulled the battery and pulled the SIM card out. I then plopped the battery back into the device and turned it on without a SIM card. Let it sit for two minutes without a SIM card. I then powered off the device and inserted the SIM card again.
3. Google Play Settings
I opened Apps > Google Settings (green icon) > Android Device Manager and unchecked Allow remote factory reset. Then, under Settings > More > Application manager > All > Google Play Store, I selected Force stop, Clear data, then Uninstall updates in that order. Then I went back to Google Settings and check the Allow remote factory reset option again. This was the most suggested solution, and even appears on a Google Support page. It didn’t work for me though.
4. Removing Account
I removed my Google account under Settings > Accounts. If you don’t have the option to remove your Google account from your Android device, it may not let you without having a second account added to the phone first. Add a “dummy” account to your Android, then remove and re-add your main account.
Finally, option 4 was the thing that worked for me. I’m not 100% sure though. Perhaps option 3 just took some time to work? Anyway, I am now free of my Android device missing from Device Manager problem. It works and I hope these steps work for you too.
If you have a different solution that worked for you, please share it in the Comments section.