@SerPounce Are you using the multidropdown plugin for the league dropdown? If so, this should be either a searchbox or a standard dropdown element (since users can select a single league in this case, instead of a list of leagues).
As long as that single searchbox or dropdown’s type matches the type of the “matchLeague” field, then that should work, but if not let me know!
@fayewatson thanks so much for the response. See below screenshots - both the matchLeague field and drop down are of type league. But I am still not able to get the filter to work