The issue is most likely that your floor eligibility isn’t the same in both cars . It’s an option on your basic features menu. It’ll say this car serves floor 1,2 etc and it will also say other car floor 1,2 etc. Sounds like the B car is wrong . If the B car doesn’t have any eligible floors for the A car correct it won’t allow the A car to answer those calls. Make sure all floors and front and rear match .