IT does not need your journey. They need a failure they can replay.
The four lines
What you were doing. What you saw โ the actual string, not "it broke." What you already tried. What "fixed" means for you โ log in, or send mail, or join the call.
Then the ask: reset this account, or tell me the next check.
Your assistant will diagnose
It will be confident. Mark it or delete it. A help desk that chases a model's certificate theory loses the morning.
They already have a queue
If policy is the portal, use the portal. If you are writing to a vendor's engineer, email is enough unless they already have an account โ then you need an accepted contact. Same facts. Same one ask.
Do not put your nickname for the vendor in the letter. Use the name on the contract.