The IRS told Vanguard that my trust name and my SSN didn't match the personal name and the SSN the IRS knows me as. The "problem" with Vanguard's titling of the account is that the title started with the trust date rather than with my name (which would have been truncated by the time you got to ".... Trust, dated mm/dd/yyyy"). So I had to mail some IRS form to Vanguard which would have been unnecessary if my trust account had started with my name.
Just as you can obtain the EIN yourself online, you can also correct any misspellings yourself. When I requested an EIN online earlier this year, I think there was a form to mail in to fix any typos, but I don't see it online. But, you should have the computer-generated or mailed letter showing the assigned EIN. Send in a copy, or at least the "stub" at the end showing the trust name and EIN and make a notation to correct the spelling and reply to you. You should also be able to send in a simple typed note. The address listed on my letter for a Michigan trust is:IRSCincinnati, OH 45999-0023
Form 8822B, which is used to report a change of trustee or address might also be used. It shows two other IRS addresses, depending on your state.