Confirm from

[Talab1234]

1. You can confirm this from him.


Is this sentence correct?
Contex: To get confirmation from someone.

 

[Barque]

Is this sentence correct?

No.

I suggest "with" instead of "from". You can confirm this with him.

Or:
You can confirm this by asking him.
You can ask him to confirm this.

Contex: To get confirmation from someone.

This isn't context. It doesn't give us any useful information at all. We could understand this from your sentence; you just stated the obvious. "Context" is something more. "Context" refers to the situation, the background, what was said earlier, why the person said that, etc.