When I went to the Buy/Sell tab, and clicked on More Info, the Godaddy Help page (the one where it asked me to pay 4.95 to be able to post a domain for sale) did not list .marketing as a valid domain to auction. I am not sure if the Godaddy Page is just out of date, or if there are some restrictions.
I believe we don't currently support .marketing gTLD domains for sale on our auction pages at this time. I'll pass this along to the folks who'll need to look into this further to see if we can make this an available option in the near future.
CG - GoDaddy | Community Moderator 24/7 support available at x.co/247support