Managed navigation / managed metadata service not working following rebuild of webapp and site collections

Hi all-

As a result of my learning curve with SharePoint, I was required to delete by web application and corresponding site collections and rebuild them.  Prior to deletion and re-creation, I am told that the Managed navigation / managed metadeta service was working (i.e. information in the Global Navigation and and Current Navigation areas populated properly).  I have looked over my setup using the following info:  https://support.office.com/en-us/article/Enable-managed-navigation-for-a-site-in-SharePoint-49a067dc-77d2-455d-9e77-250ec7cc0a6d and all appears OK in the operational environment.

One thing that occurs to me is the need to delete/re-create the term set or update it.  Is that a possibility?  To my knowledge, the term set has not been changed/updated since the webapp and site collections were deleted and re-created.  Are there URLs in the term set that need to be updated to reflect the new URLs of the host-named site collections?  Other troubleshooting articles I might check out?

Thanks in advance and apologies for silly questions....still getting up to speed.