I noticed my Honda Accord 2018's battery was going bad so I had it replaced professionally. Right after it was replace I had issues mostly around the key fob and starting the car.
First off my key fob is fine, it was working before the battery change, I have 2 and I even replaced the battery on the key fob.
The issues are that the car doesnt recognize there is a key at all. I have to manually open and lock the doors with the actual key. The car will start but the key fob has to be right next to the push to start botton. My car also wont go into accessory mode just straight to engine start. The car doest seem to recognize the key at all expect when I start the car from a very close/touching position.
What could be the issue and how can I fix it?

Thanks

 

Check under-hood Fuse No. A27 (10A) - back up fuse.

The back up fuse powers the key-less components, including the START button. If that fuse was blown, the car may not start if the key fob was not near the START button; but, could start when the key fob was near the START button.