O365 and Dirsync

So you want to add an alias to a user synced to O365? Fat chance. Since it is synced you cannot adjust the user attributes including adding an alias. You have to remove dirsync or adjust the attribute in ADSIEdit and wait for it to sync. Not the best method.

Set-MsolDirSyncEnabled -EnableDirSync $false

To verify:
(Get-MSOLCompanyInformation).DirectorySynchronizationEnabled

Proxy Address through ADSIEdit:

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