Nissan Intelligent Key issue

https://immobilizerfaultnissansource.greyhavendaily.com/posts/how-to-diagnose-and-fix-an-immobilizer-fault-in-your-nissan

You're in a hurry and your Nissan's key fob stops responding—no click when you press unlock, and the car just sits there, ignoring you. It's a typical Intelligent Key issue, often triggered by a dead button cell battery inside the fob or a temporary loss of sync between the key and the car's receiver. Sometimes, dropping the fob or leaving it near strong magnets can scramble the code, forcing a manual start with the mechanical blade and a trip to the dealership for reprogramming.