Ring Chime Pro Won't Reconnect After a Network Equip Failure

My ATT Uverse internet was down for about 36 hours due to an ATT equipment problem in my neighborhood. After the service was restored, my Ring Chime Pro will NOT reconnect to my Wi-Fi network. All of my other Wi-Fi devices reconnected without a problem including the Ring Video Doorbell 3. I've tried the reconnect process several times but the result is the same - a flashing blue light for about 15 - 20 seconds that changes to a flashing red light and then an audio message that says "There seems to be a problem with your internet connection". The Ring Chime is plugged into an outlet that is 15 feet, direct line of sight to the router. My ATT router is a Motorola BGW210-700. It's a dual-band 2.4/5 GHz gateway. What can I do to get it reconnected? Thanks for your help!