Key presses on iPhone 6s not passing to auto attendant

Hello Experts - Our company switched to the iPhone 6s and we've run into a problem.  The phone does not appear to be correctly passing number presses when dialing in to our phone system and attempting to use the auto attendant directory.  Instead, it will constantly say the name was not located.  It works fine when not using Apple Carplay from the same location.  Any ideas on what I can do to fix this?
danbrown_IT ManagerAsked:
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Jackie Man IT ManagerCommented:
iOS version?
danbrown_IT ManagerAuthor Commented:
The latest, 11.x
Jackie Man IT ManagerCommented:
All iPhones have the same problem?

Press the key via the Phone app?
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danbrown_IT ManagerAuthor Commented:
I haven't tried all of the phones, its just two that people that are using apple carplay and they both have the issue.  I've tried wiping one of the phones but that didn't make a difference.  I can't find much online for the problem either, seems like an isolated issue.
Jackie Man IT ManagerCommented:
https://forums.macrumors.com/threads/ios-11-broke-my-carplay.2070328/page-3

It is a known issue. Have your car manufacturer released an update yet?

Or do you disable the Bluetooth before connecting via the genuine lightning cable to the CarPlay receiver?

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danbrown_IT ManagerAuthor Commented:
I'm not sure if the car is fully updated, we'll give the Bluetooth thing a shot, thanks for the help!
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