Add / Change Office365 alias when user AAD Connect or Passtrough Auth

When you add new e-mail aliases, you need to make sure that your primary e-mail address is included and prefaced with with upper-case ‘SMTP:’.  Your aliases, aka, secondary addresses should be prefaced with a lower-case ‘smtp:’.  For example, I want my primary e-mail address to be

In the proxyAddresses attribute use the following format:
to make an alias I will specify lower case “smtp:” like this: “”


Note: If you are troubleshooting an email address assignment issue you mail want to look at the ‘mail’ attribute as well.

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