Getting error: You do not have sufficient permissions to access this page.

When signing up for a new website, I’m getting this error message: “You do not have sufficient permissions to access this page”. If I wait a minute or so the link will work so I’m guessing that something is processing slowly on the backend or a setting needs to be changed. A new site visitor will click on the link immediately and will not know to wait a minute. Please advise a remedy. Thanks for your help.