Ha! You're diving into the world of e-bikes, I see. Well, let me tell you, it's a rabbit hole of its own. Now, about those charging incompatibilities – it's usually one of three things: a miscommunication between the charger and bike, a faulty charger, or a bike that's gone rogue.
To identify the root cause, first, try a different charger on your bike. If it works, congratulations! Your charger was the culprit. If not, well, your bike might just be impossible to please.
As for diagnostic steps, there's this nifty little tool called 'common sense.' It's not exactly high-tech, but it gets the job done. And when purchasing a new e-bike or charger? Stick with reputable brands, and always double-check compatibility. After all, you don't want to end up with a power couple that's doomed from the start.
Best of luck, and remember: incompatibility is just another opportunity to upgrade!