When I moved my Philips Hue bridge got damaged. Turns out there is no way (and I tried) to get your lightbulbs to reset and attach to a new bridge. Not very happy with Philips Hue, wish there was a better option out there.
Steps are as follows:
Turn the bulb on for three seconds and then off for three seconds, repeat a few times, then turn it on and it should blink. Turn it off, start the pairing/search process and then turn the bulb back on.
It helps to use a lamp/light switch if you have them somewhere that requires plugging/unplugging to turn off.
you can do a re-pair by typing the bulb's serial number into the app and it will force the bulb to forget it's hub.
You can also reset them using the dimmer.
Failing that, https://huetips.com/lamp-finder/ has worked for me in the past for finding awkward devices that I didn't have the serial number for (older LivingColours devices).