According to this article in The Hill, Andrew Yang won’t be on the March 2020 Ohio presidential primary ballot because most of his petitions did not have a copy of the signed declaration of candidacy signed by Yang. He will campaign as a write-in candidate in that primary.
The Ohio official list of candidates won’t be released until January 7. Thanks to Jim Riley for the link.
The ballot access laws in each state can be very confusing and you really have to follow them closely to make sure you are doing everything properly.
It appears Yang withdrew his paperwork before it could be rejected. Perhaps that is a requirement to running as a write-in.