Hello,
Thank you for posting to the PayPal Merchant Technical Support Community.
I have confirmed that require Billing Address has been added to the sandbox account. If you have another sandbox account that needs this added, please feel free to comment the Merchant Id/Payer Id.
Note : This functionality can be enabled on sandbox accounts without prior review, but within our production environment this functionality does have to be requested and a review process occurs to determine if your account is eligible. Just so you're aware.
Thank you,
Jennifer
PayPal
