Exchange 2016 Setup

Good Evening,

We are in the process of migrating from Exchange Server 2013 to 2016.  I am following the deployment guide off of the Microsoft website, but we are having issues on the AD Prep in our active directory.  This is what we are running:

Setup.exe /PrepareAD /OrganizationName:"<organization name>" /IAcceptExchangeServerLicenseTerms

I have attached the Exchange Setup Log File.  I'm just learning Exchange server administration, so any assistance is greatly appreciated.  Thank you.
ExchangeSetup.log
J DSystems AdministratorAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
[01/03/2018 23:29:47.0781] [1] 0.  ErrorRecord: An Active Directory Constraint Violation error occurred on DC1.fnbancs.local. Additional information: The operation failed because UPN value provided for addition/modification is not unique forest-wide.
Active directory response: 000021C8: AtrErr: DSID-03200BF6, #1:
	0: 000021C8: DSID-03200BF6, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 90290 (userPrincipalName)

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you need to check and fix SPN issue

SPN and UPN uniqueness
https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/component-updates/spn-and-upn-uniqueness
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Lee W, MVPTechnology and Business Process AdvisorCommented:
If you're just learning this then STOP.  Setup a test network.  Ideally, restore a copy of your main network to some VMs and TEST this.  Do it right the FIRST time.  If you don't have the knowledge or experience, then hire a pro to work with you.  That doesn't mean the pro will have all the answers instantly, but they'll know what to do and how to start resolving issues and make sure you get things working properly.
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McKnifeCommented:
J D, what do you make of that log file? If I download it and search for "Error" in[], I immediately find
"The organization name, <FNB>, can't be used because it contains invalid characters." and these seem to be "<" and ">" - did you enter those?

Of course I also agree that a test domain should be used when first steps with exchange are made. Visiting some seminar, first, should be also considered.
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J DSystems AdministratorAuthor Commented:
Thank you all for the reply.  Yes, this is in a test environment that is an exact replica of our production environment, so anything I try will not impact production.  

@McKnife, I did remove the <> from the command, and still no luck.  

@Seth Simmons, I am reviewing the article you sent me now.  Thank you.
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McKnifeCommented:
"I did remove the <> from the command, and still no luck" - upload a new logfile, please.
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J DSystems AdministratorAuthor Commented:
Sure thing, thank you McKnife.  Here you go.
ExchangeSetupLogs.txt
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J DSystems AdministratorAuthor Commented:
@Seth Simmons, your article helped out tremendously.  I was able to find some duplicates in ADSIedit, and upon removing the duplicates, I was able to move forward with the setup.  

Thank you all for taking the time to give advice, and for looking at the logs, it is greatly appreciated.
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McKnifeCommented:
The 2nd log would have been interesting, too - it is not complete, just a few lines present.
But anyway, good that you made it.
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J DSystems AdministratorAuthor Commented:
Everything is going smoothly now Mcknife, and again, I appreciate your time.
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