ACNH Island Transfer Tool: Communication Error

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How you can fix the Communication Error from the ACNH Island Transfer Tool when the solution on the official Nintendo forums just aren't working for you.
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Nintendo's Animal Crossing New Horizons (ACNH) Island Transfer Tool (ITT) is giving a cryptic error message. Hundreds of people had experienced the same issue, as forums were flooded with questions on this. I decided to resolve the matter and reproduce the fix. Here is a comprehensive guide to fixing the communication error message for ACNH using the Island Transfer tool. The error is likely due to the fact you can’t run the same software on two devices signed in to the same account at once.