He wanted to know how/what I'm doing with my report.

[sitifan]

He wanted to know how I'm doing with my report. (My bold.)
Source: Hanlin English for Junior High Students in Taiwan, Book VI, page 69.

Can I use "what" instead of "how" in the above quotation?

 

[SoothingDave]

Not if you want the same meaning.

 

[sitifan]

Not if you want the same meaning.

What's the difference in meaning between "how I'm doing with my report" and "what I'm doing with my report"?
https://www.collinsdictionary.com/dictionary/english/whatdo-with
https://www.ldoceonline.com/dictionary/do-with

 

[Tarheel]

Q: How are you doing with your report?
A: Quite well. It should be finished soon.

Q: What are you doing with your report?
A: I'm working on it.

When you ask a different question you will get a different answer.