Catalina 10.15.5 Bluetooth (Keyboard) Connection Not Working MacBook Air (13-inch, Early 2015)
Catalina 10.15.5 update (last night when I went to bed)
Bluetooth: 7.0.5f6  
Firmware Version: v150 c9318 (from About Thus Mac; System
Report;Hardware; Bluetooth).


This morning, 2009  Wireless Keyboard not connecting, not even seen.

Also posted with another user at Apple Communities here.
What have you already tried to fix this? Does the keyboard connect to any other device? Can the MBA connect to any other BT device? Have you performed the usual troubleshooting steps of reboot and/or reset SMC? – fsb Jun 3 at 16:23


Thanks fsb the SMC reset did the trick.