Messages+ on Prepaid Integrated Messaging

So I have a prepaid line that we use as a company phone. I was trying to use the Verizon Messages app on my phone as well as on the computer so that I make sure I don't miss a text. When I set it up on my personal phone nothing syncs up and the messages don't come thru and when I go to set it up on the computer it gives me an error saying that its only avalible for valid verizon wireless numbers. 

I contacted chat support and they told me that its not avalilble on prepaid. But I could have sworn that I've used it on another line in the past. 

Anyone have any advice?? Anyone use it with a prepaid line??