For tax year 2020, I filed my first ever Schedule H as we had a nanny. I used an existing EIN/Employer Name, which was my Single Member LLC. That return was accepted.

Now, for 2021, I've not changed anything; filed the W-2/W-3 using the EIN and Employer name, set up Sch. H, etc. But now, my return is being rejected because of a Code: SH-F1040-520-01 which is telling me that 'EmployerEIN' and 'EmployerNameControlTxt' must match data in the eFile database.
I know the EIN is correct; I am assuming the error is coming from the fact that my actual name is in the box listed where it says 'Employer Name' on Sch. H (which is the exact scenario from 2020). 

What is the issue here and why am I unable to type the name I want in there?