I had the same issue.  I need 1099-MISC.  I had to create a new account for the account that previously was Rent with subcategories of Land, Buildings,  of Equipment. I am not positive but I think QB created the new account of "Rent of Land and Equipment." I do not remember creating that account.  I had to go to all the payments and change the account to the new account.  I then put that account in the Vendor Account settings and verified that the box was checked 1099 and the SS# number was there (which it was) in the Tax settings.

I then had to go to the list of Vendors and uncheck all and then go through the entire list and check the Vendors that I wanted to send a 1099 to.  

I spent over 3 days off and on as well as reading lots of info online.  It took a lot of time and was unnecessary since the way it worked prior to this year was much more straight forward.  Also, everytime you leave the process you have to mark each Vendor again each time.  It will not save your selection.

You can no longer process the forms under Vendor Center.  It has to be processed under "File", "Print Forms", and then choose 1099 and 1096.

Hope this helps.  QB should have kept the system the way it was and ADDED the 1099-NEC instead of changing the 1099-MISC process.