Sync issues between SBS 2011 Exchange and iPhone

We have a SBS 2011 server using Exchange 2010.  We have several users that have their emails syncing on their iPhones.  I am having issues with one user getting their emails to work on their iPhone.  I have tried to configure this user on my iPhone with the same results.  We both are using iOS 11.4.1.  Everything is configured correctly and I get all check marks after manually configuring the mail server in Accounts & Passwords.  But when I go to the Apple mail app it comes up with the message "Cannot Get Mail  The connection to the server failed."  I'm thinking it is a problem with this particular user because everyone else that I have on iPhones is not having this issue.  Any ideas or suggestions would be greatly appreciated.
John BoltonAsked:
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timgreen7077Exchange EngineerCommented:
First thing to check is wheter inheritance on the user AD Object is disable:

To check whether inheritance is disabled on the user:
1.      Open Active Directory Users and Computers.
2.      On the menu at the top of the console, click View > Advanced Features.
3.      Locate and right-click the mailbox account in the console, and then click Properties.
4.      Click the Security tab.
5.      Click Advanced.
6.      Make sure that the check box for "Include inheritable permissions from this object's parent" is selected.
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timgreen7077Exchange EngineerCommented:
Also see what would happen if you use the outlook app for IOS.
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John BoltonAuthor Commented:
Thank you timgreen7077, that fixed the problem!
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timgreen7077Exchange EngineerCommented:
great.
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