Hi Rich_Art, here I've attached a 3DM file with those front faces combined to just a single surface, it should probably fillet more easily now.

I combined those faces by first deleting them:



Then I extruded the bottom circle upwards far enough to encompass where both those faces were previously:



Then used Edit > Trim to cut the bigger surface with the other piece above and removed this area:



Then Edit > Join can be used to glue the pieces together into a tuned-up solid and just that little bit of cleaner topology will be more friendly for filleting, especially since the 2 previous pieces were not quite 100% identical surfaces, it looked like the bottom piece was an extrusion but the top one was maybe a sweep or came from a slightly different generator curve or something like that.

- Michael