Good, thought I may have unintentionally said something that provoked a negative response.
That fillet was created not with an extruded sketch but the fillet command.
For the heck of it I just re-created the body and press/pull does effect the fillet now with no errors but does not extend the ears while maintaining the same fillet as I was needing.
I can adjust the sketch to accommodate and re-fillet easy enough, It pulls the squared ends no problem and wait till last as you suggested to fillet, something must have went south that is causing the errors.
I agree, Fusion 360 is remarkable, endlessly amazing me and frustrating me equally LOL, I've years in another CAD/CAM a non parametric and it's been a battle unlearning in order to use Fusion.
Thanks again.