@lalalandsynth
I signed up as my company, but Iโm pretty sure that either sole proprietor or company enrolment is fine for notarising. You will need your D.U.N.S number though.
I only had my Apple ID verified and completed end of last week so I havenโt tried notarising anything yet (still working out how to even do it ๐)
If you are unsure about anything though, Apple support were really quick getting back to me when I had questions and they helped me get everything sorted with my enrolment. I just used the contact form on the website. They assigned me an assistant that emailed me everyday and even rang me at one point until I had my account setup. I was pleasantly surprised with the quick support, considering a lot of other companies during the pandemic have only had limited staff on customer service jobs.