I receive but cannot send SMS or iMessages on my MacBook with Big Sur
I get all my incoming SMS and iMessage on MacBook but if I try to reply it says "Message not delivered" with no other explanation. It doesn't matter if it's sent as an iMessage or SMS, both fail. The same messages send fine from my iPhone 12 Pro.
macOS: 11.0.1 (20B50)
iOS: 14.2.1
iPhone 11 Pro