You have been blocked for a day. The ticket you filed was one line. The reply is a form you already thought you had answered. Nobody is being difficult. The person on the queue has never met you, and "I need prod" is not a fact they can check against a policy.
Write for a cold reader. That reader is IT.
Four facts, in that order
The grant. System, environment, role. The name they use, not the nickname your team uses. "Read on the payments warehouse, production, the analyst role" is a grant. "The billing thing" is a meeting.
The reason. One sentence of outcome. "I need to confirm the March overage for a customer credit the AE will issue today." Not "for a thing I am doing."
The duration. Standing, or until a dated hour. Standing is the expensive one. If you only need a window, say the window. People ask for forever because it feels easier. It is how the ticket waits for a heavier review.
Who already said yes. Name, date, in a sentence. If nobody has, say that. A hallway yes you cannot point at is not a yes on this queue.
That is enough for a decision: grant, grant time-boxed, or refuse with the policy sentence. Respect their time by not attaching your autobiography.
Do not make them hunt
A briefing is text. Paste the policy exception number if you have one. Link the incident. Do not assume they can open your chat. Do not assume they know which "prod" you mean when your company has four.
Label guesses. "I am assuming the analyst role is enough and I do not need write access." If that is wrong, they can correct the line instead of rejecting the whole ask.
Send it once, with a default you can live with
"If I have not heard by 16:00 UTC I will unblock the customer another way and withdraw this." Or: "This can wait until tomorrow; I do not need an after-hours page." Urgency you do not mean is how the next real incident waits behind yours.
You approve the wording. If the IT partner has an account, you need an accepted contact. If they do not, they get email and a page. You do not need to be on their ticketing seat for the brief to arrive; you may still need their ticket for the grant itself. The brief is what makes that ticket completable.
If you already explained the block to an assistant, connect it and have it extract the four facts from the story.