The camera solver works for the nulls, but it won’t give you an accurate full scene solve, just an accurate solve for the location of your surface tools. So you have to hook objects up to only those positions. If you need a full scene solve, you’ll need to use a traditional camera tracker. The 98% solve you got is what we consider to be a good solve. So if you need to put text, particles, and objects into the scene, it should work for you. If you need a full set, you’ll need to try a different solver.
Let me know if you have any more questions and I will be happy to help you.
Cheers,
Mary