I was not getting an update notice in Windows settings. The problem with the Inspiron not updating is listed as drivers for the Conexant audio drivers, and the problem is still not resolved. See the Microsoft release information page for information.
Dell has a listing of computers tested for Windows 10 2004 update. My Inspiron 7359 2-in-1 is not on the Dell approved Windows 10 2004 list. The last Windows 10 update approved for my Inspiron 7359 2-in-1 is Windows 10 1803.