Garageband No Input Source Selected

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Garageband No Input Source Selected Airpods

I am trying to set up my recording equipment and I have encountered difficulty getting garageband to recognize that I have a mic plugged into my interface. My mbox mini is hooked up to my computer, garageband allows me to use it for my audio output (monitors I have hooked up to the mbox), but i have not been able to pick up any sound with my external mic (an AT2035 cardioid capacitor mic).
I have selected the mbox as the audio input for garageband. When I go to the real instrument track info, the three options I have for input source are mono 1, mono 2, and stereo 1/2. None of those three options have resulted in sound being picked up by garageband. None of those options allow me to control the recording level bar which remains dimmed. I am very new to recording and don't know where to begin in solving this problem. I would be so thankful for any help.
Matt

Garageband Says No Input Source Selected

The In level slider is available if your iPad or input source supports input level control. If the input device supports left and right channels, tap Channel button under the In level slider, tap Input 1 or Input 2 to select the input channel, or tap Stereo to record in stereo. GarageBand has a built-in tuner that can work with instruments plugged into your Mac’s selected audio input or picked up via a microphone (including your Mac’s built-in mic).