If you did not enter an amount that you spent on the solar device, then the credit calculated should be zero. Check form 310, line 18, and make sure it was zero.
In this case, the supposed credit did not affect your AZ refund or amount due.
You should write a note to yourself on what happened - i.e., form 310 was added to your return when it didn't need to be and you actually didn't buy any solar equipment - and stick it in your tax file in case anyone ever asks about it.
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