When playing back a keyword script in Firefox v78.7.0 the autocomplete does not work

Our team is evaluating Test complete version 14.81.  We have a lot of web applications that we are trying this tool on.  My current script has a website that I browse to using Firefox and once the web site is loaded, there is a user lookup icon that is clicked.  Once this page opens, the script types in the first user name from my excel spreadsheet. Next the website auto will lookup or autocomplete the query for the user then you can click on the user's profile.  This is the part that does not work when we play back the actions in the script.  We added a delay of 15 seconds and this did not work either.  Is there something wrong during playback?