Assigned letter from an authorized representative of the organization

Question

Hello, I am a director of a TR registered LTD company so i was required to submit authorized representive letter to verify my Microsoft Partnership account.

Microsoft asks me to submit a letter of authorization affirming that i'm authorized to manage this account on my company’s behalf and the letter, but i am the owner of the company. How am I supposed to write a authorization letter to represent the company on my behalf if the letter needs to be signed at the end by someone else? And if i need to write a letter anyways, what format do i need to write with? I couldn't find documentation regarding this issue.

Can you please help me ?

Thank you