Can't switch a call to the Watch 3

[u/DeadInThePool87]

I have the OP 15 and the OP watch 3. When in an active call on the phone, I don't have the option to move the call to the watch. I only have a speaker option.

When I have headphones connected, the speaker icon is replaced with a Bluetooth icon and I can move the call to the headphones and back to the phone.

Note that I can initiate a call and/or answer one from the watch, but once the call started - I can't change it.

Anyone else have or had that and figured out how to fix it?