My logitech MX keyboard is not discoverable by m4 mac mini

Updated from a an M1 mini to an M4. My Logitech MX bluetooth keyboard worked great with the old M1, but the new M4 mini cannot detect it. (it sees the TV downstairs.) Yes I have tried ALL of the standard troubleshooting methods, and it just ain't there. It sees my speakers, an old keyboard, that I'm using now, and any variety of mice. All bluetooth, but not the keyboard. Anyone else?