GE light bulb would blink as if it has been paired but would not appear on app (Help)

Oh, my apologies. Here are a few links that might help you with troubleshooting GE Link Bulbs. Unfortunately GE Link bulbs can be somewhat flakey and there is a known bug in the firmware that can cause them to drop off the network sometimes. For that reason, it’s not officially supported by SmartThings. That being said, many, including myself use them and they work most of the time. Try bringing the SmartThings hub within a few feet from the bulbs that you are trying to pair. Reset the bulb by turning it off and on 5 times pausing about 3 seconds each time. After the fifth time on, it should blink. Go to the marketplace icon in the SmartThings app (bottom righthand corner) and click on the + Connect a New Device link. This will put the SmartThings hub into search and pairing mode. Hopefully, your bulb will be found successfully.
https://support.smartthings.com/hc/en-us/articles/204833550-GE-Link-LED-Bulb