When the Logitech Solar App isn't detecting the K750 keyboard for Mac, it may be because the:
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Keyboard is out of range
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Keyboard is not connected to the receiver
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Receiver is not securely plugged into the computer

Try either plugging your receiver into a different USB port or reconnecting it to the keyboard.
NOTE:For instructions on how to reconnect, see answer 360023404533.
Once the K750 keyboard for Mac is properly connected and being detected, it will display in the Solar App, as shown below.

Important Notice: The Firmware Update Tool is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
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Important Notice: The Logitech Control Center is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Connection Utility is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Unifying Software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The SetPoint software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
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