My harmonix wireless rockband guitar doesnt register as an instrument

So I have an issue with my rock band wireless guitar, i can successfully connect it to the dongle and use it on the rockband menu, but when I enter the instrument screen I get a box saying a microphone must be connected for all singers, I’m not sure what to do, I have tried it with both rockband and Green Day rockband as these are the only two I have for this system, what do I do?

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