If the vehicle started before on this key then it should start now using this key. However, is the theft light on when you turn the key to the on position? It should come on and then go off when the ECU gets valid signal from the immobilizer.
However, it sounds like you have a connector that is still unhooked or not properly seated. This issue reminds me of a different Honda that I helped someone with a while ago and that turned out to be a connector issue. He had actually taken some connectors apart to try and find a brake light issue and didn't get them back together and that cause a no start issue.
Below are the fuses that we need to check that run between the passenger and driver side fuse boxes.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Let us know about this info and we can go from there. Thanks
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Saturday, May 8th, 2021 AT 8:47 AM