I cannot get a Transfer Order to show up as demand in my MRP. Any clues to what I am missing? The item shows up in MRP and Sales Orders will provide demand, but I cant get the TO to.

Is it in the past? If so, you may need to adjust item-location data to consider days in the past

Ship date on the line is tomorrow, transaction date was yesterday, but it did not show up yesterday either.

If using Supply Allocation, There is the SRB "supply required by date", Other things to check is it approved, make sure "Exclude From Supply Planning" is not checked.