Looks like a fraud to me. In general, they should ask about your technical skills, project experiences and understanding on Azure platform but what they ask is, your azure account credentials which is very strange.
If they really have a company, they should have their own Azure accounts, subscription for company and enough budget to pay subscription bill. But they want to use your one Month free credit, very unusual!
Please don't forget to Accept Answer and Up-vote if the response helped -- Vaibhav