I had never discussed with him how much does he get a salary?
I had never discussed with him his salary.
Are these correct sentences?
No, they are not. Have you read about indirect questions ? In case that you have not, you can read the following article.
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No, they are not. Have you read about indirect questions? In case that you have not, you can read the following article. https://www.grammar-monster.com/glossary/indirect_questions.htm
At the end of the article you will read about the correct word order, which is the