Update enroll-a-device.md

[mjtart]

More specific information about the regional URL requirements. Update troubleshooting with link to more coprehensive agent test tool.

[ghost]

All CLA requirements met.

[opbld30]

Docs Build status updates of commit e2675ce:

:x: Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	:x:Error		Details

• [Error: CannotMergeCommit] Cannot merge commit e2675ce3cf89a12369d67133bad7ca734ce30ff8 in branch patch-4 of repository https://github.com/mjtart/OfficeDocs-SkypeForBusiness into branch live (commit bfec73878a203fcdfa5da4733bd5d52e78dfdf96). Please follow this documentation: https://help.github.com/articles/resolving-a-merge-conflict-using-the-command-line/ to use git.exe to resolve you content conflicts locally and then push to remote.

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