Today I received an email letting me know that I was not eligible for a unique Google + Custom URL.
Here is some info on custom URL in regards to Google +
Requirements for getting a custom URL
Before you can get a custom URL, your account needs to be in good standing and meet the following requirements:
Eligibility for People:
Ten or more followers
Your account is 30 days old or more
A profile photo
For more info follow this ‘link‘