See subject. Call history will show the VM recevied. It will offer to play it. But it will then report "Unable to retireve" or something like that when you attempt to do so. My wife and I are both experiencing this problem on our unlocked (Google store, non-VZW) Pixel 2s.
VM via long press 1 in dialer works fine.
Another user experiencing this problem has attempted a Factory Data Reset and it solved nothing.
How do we get this to work as expected and work over WiFi Calling as it works over the wireless network?