What you describe is not technically an appeal as in a missed base, leaving early on a caught fly ball, check swing where the umpire is obligated to rule on the appeal. An umpire is not obligated to get help on a judgement call. I believe you should only do so when there is the possibility your partner really has a better view. I have coaches ask me for help from the PU on a runner caught stealing second. Unless I got screened or a bug flew in my eye I will politely tell the coach I had the best position and don’t need help. I used to be more accommodating but coaches started getting nit picky and abused the privilege.