I have checked the settings in Voice, tested other numbers and those come through fine, added the Zillow number to my contacts and it still won't come through.

That's a good idea to close the shutoff valve to test the pipe under the sidewalk.  

They recruit, interview, check references, skills test, criminal background check and drug test. 

You have a governmental authority using its power to hinder and regulate private transactions creating some kind of “litmus” test based on god knows whatYou have a seller remaining in a home he sold indefinitely.You have a lender that has twice filed for foreclosure You have a profit sharing arrangement upon resale with the seller/tenantYou’re performing repairs/maintenance on a house while occupied by the seller/tenantAny or all these are lawsuit magnets.If you buy a property, and the seller is a consumer, not an investor, you should NEVER do a profit participation.  

It's well organized, tried and tested.

So, they are more likely to rely on the easy data they find, without delving into the market data more to verify it.

You can qualify for this by:Having tenants for 7 days or less at a time.Materially participate, typically with the test: You participated in the activity for more than 100 hours during the tax year, and you participated at least as much as any other individual (including individuals who didn’t own any interest in the activity) for the year.If you materially participate, you can offset your non-passive income even if you have W-2 income.

I have to collate a few programs together to get max data exposure / quality.

MAKING SURE THE SOIL IS TESTED TO MAKE SURE IT CAN STAND THE PRESSURE I ASSUME, LAYING THE SLAB OF CONCRETE KEEPING IN MIND OF UTILITIES AND ETC.

You can't possibly posit what makes sense to do or not do in one area of the country based solely on data from your market.