B1 Bulb cannot connect to the app

 Have a B1 bulb. Haven’t been using for a while. Tried to connect with the app today, bulb has detected but Lepro Wi-Fi signal is missing, hence cannot connect the bulb. I checked my Wi-Fi signal Hz, it’s compatible, restarted both phones and bulb, tried another phone and app, still not able connect. Any hints to share? Thanks and appreciate your support.