iPhone XR setting off shop alarms

Similar instances will occur with automobile key fobs. Some security systems are set much to sensitive and will react to those in your pocket. Try putting the iPhone in your pants pocket or a purse and carry it lower than your waist if possible. There really is no other option except to turn off the iPhone before you pass through.

the only guess I could come up with is some type of near field communication signal possibly causing the alarm to go off. Where I work, the alarms are triggered by magnets. We have what is called a turtle alarm on some products. These are deactivated with a magnet. If one of the managers walks through the alarm area with one of the portable magnets, the alarm will sound.

I have no idea how that could happen. If no one else provides any suggestions, I would talk to someone at an Apple Store to see if they have any answers.

Are you saying that when you leave work with your phone that an alarm system in the building gets activated. If that is the case, I would suggest working with the building manager to try to find out why that is happening.