I can’t answer a call from my Apple Watch.
I use to be able to answer a call on my Apple Watch, now it rings but I try and answer it but can’t hear anyone
Apple Watch Series 7, watchOS 8
Did you try to make a phone call if Wi-Fi calling is enabled?
Make phone calls on Apple Watch - Apple Support
Resetting the network settings could also be an option, but you will lose all saved passwords for your Wi-Fi networks.
Unpairing the watch and connecting it again to your phone would be the next step, to rule out a software issue: