New Edge Transport install - required certificate?

I'm getting an error with my ET install:
Exchange Server component Edge Transport Role failed.
Error: Error:
The following error was generated when "$error.Clear();
Install-ExchangeCertificate -DomainController $RoleDomainController -Services SMTP
" was run: "Access is denied.
Access is denied.
I was going to try to install a certificate manually, but I actually am not sure what the requirements of the cert are. This is in a test environment, so nothing live is affected. I was going to just try to self-sign a cert for the server and install it.

Can you post the error portion from ExchangeSetup.log to get more idea where it is giving access is denied error?
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