A little more info will be useful. Do you have any United or *G status? Are you in coach or business/first?

United-defined bag fee waivers for Premiers only occur at United counters. If you have *G status, you may be eligible for *G bag benefits. Bag charges are dues each time you check in. Normal United bag charges are the starting point at each check-in and will be adjusted/not adjusted based on cabin/status/operator .