Messages app is doing things I don't understand
For example, when my bank or someone else sends me a two step verification code, I get it on my phone, but not the Mac I'm sending it from. I've gone into Messages>Preferences and everything is the same as it has always been. I'm using Big Sur, which was true when things were working fine.
Even worse for me is that I sent a message today to someone in my Contacts book and it failed every time I tried. Usually I can apply logic to find solutions, but this thing has me stumped. Any advice would be most appreciated.
Mac mini, macOS 11.4