There is not a biz and personal version of a card. They are two completely different products. It is unsurprising that you are unable to covert between them.
There is the PayPal Business Debit Mastercard which is a debit card linked to your PayPal balance and gives 1% cashback on signature transactions. It is available for signup online only for Premier and Business accounts through your existing PayPal account. Separately, your PayPal account can be loaded with PayPal Cash cards, but it is risky.
There is a prepaid Paypal Debit Mastercard product that you buy in a store. It has a fee and is inferior to other prepaid products out there.