Hi - home hub max video calls are terrible because the volume is significantly lower than any other sound that comes from the hub. This happens on all video calls.
It's strange because the music volume is just the opposite - way too loud. Is this a known issue?
Thanks for visiting the Community.
We're sorry to hear that you have to experience this. Controlling volume on making phone calls is only available when controlling it physically. However, you might want to check this link for more commands that you can also try: https://goo.gle/3Pkarev
Could you send us a video showing the issue so we can further check what's going on with your device. Also, does it happen to all video calls? Have you tried the commands listed on the link shared by @Princesss?