Every Mitel account is identified by a numeric Account ID.
When you receive a “Welcome to Mitel MiVoice Office” email, this Account ID is included in the email. When a new user installs the Mitel MiVoice Office app and then registers their mobile device, the Account ID is required only when one of the following is true:
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Your business email address was not provided to Mitel when you were entered into the MiVoice Office system.
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Your business email address was provided to Mitel, but it's on a public domain such as @ gmail.com, @ yahoo.com, @ outlook.com, etc.
If you are trying to register or log into the MiVoice Office app (named "Mitel Office" on your phone) and you are prompted to enter an Account ID, locate the “Welcome to Mitel MiVoice Office” email that was sent to you previously and use the numeric code displayed at the bottom of the email. Otherwise, contact your IT or phone administrator.
For related information, see Register Your Mitel MiVoice Office App and Log In/Log Out.