Strange wireless bluetooth results - Raspberry Pi Q&A, Help & Troubleshooting

Recently loaded Pop-os then Ubuntu after having issues with a wireless keyboard both OS's have the same results so the issue must be related to the Pi itself. I completed the following:
Logitech MX wireless bluetooth keyboard functions normally with Pop on 2 other computers
Logitech 520 wireless USB Unifying Receiver keyboard functions normally with Pop on 2 other computers
Logitech wireless mouse works also with the USB Unifying receiver
Loaded distribution on Raspberry Pi 4 [did not use the Raspberry linux]
Pi 4 has both USB and bluetooth capabilities
connected a Logitech wireless mouse with the USB Unifying receiver: functions normally
connected a USB wired keyboard: functions normally
connected a Logitech MX wireless keyboard via bluetooth: connected and functions normally
Disconnected the USB wired keyboard
MX keyboard stayed connected via bluetooth but no longer would send commands to the Raspberry
Reconnected the USB keyboard: Mx wireless keyboard functions normally as long as the wired keyboard is in place
Connected the 520 wireless keyboard with the USB Unifying receiver: it also functions normally but no longer functions if the wired keyboard is disconnected
Anyone have any idea where to go with this? Appreciate any comments.

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Another member, Wolfpack612, here told me that Logitech k400 keyboard with touchpad works. So I tried the k400 and it works fine.
The same member, Wolfpack612, told me that the Logitech mouse m570 works too.
I also used Logitech LX8 Laser wireless Mouse and Logitech Wireless k320 Keyboard with the Smart Dock and works fine.
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Others may have another idea and information.
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