Unable to add Wemo doorbell accessory to HomeKit - it ask me to connect iPhone t o my HomeKit enabled router

Hi

Im trying to connect new Wemp doorbell to my main HomeKit Home

i keep getting the following error

"Unable to add Accessory , To add this accessory to your home , connect your iPhone to your HomeKit enable router , then try paring , if paring continues to fail reset your router "

However when Im adding this accessory to new Home (by creating new Home in my HomeKit) the Wemo doorbell is added and working currently

Unfortunately I do need to add this device to our main Home , which include all our other Home accessories

Please Advice

Thanks