Brad Niemand .. "Adding support for suggestions for Subaddresses is on our list of work that we will be doing but it will not be in 2.4.4 nor will it be in 2.5 which is already dev-complete and will be release in early 2020."
https://community.esri.com/ideas/17738-locators-why-are-suggestions-different-than-results-make-them...
Cross-post - Will we have a functional Locator that supports Units (i.e. Suggestions for subaddresses) in Pro 2.6? And results from Suggestions and from clicking Enter that are the exact same?