When migrating from Google Apps, the following error is seen, "invalid_grant", Description:"Not a valid email." (149400)

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Title

When migrating from Google Apps, the following error is seen, "invalid_grant", Description:"Not a valid email."
Description

When migrating a user from Google Apps, the following error may be seen in the migration log file:
2015-02-20 17:00:39,948 One or more errors occurred. Error:"invalid_grant", Description:"Not a valid email.", Uri:"" System.AggregateException: One or more errors occurred. ---> Google.Apis.Auth.OAuth2.Responses.TokenResponseException: E rror:"invalid_grant", Description:"Not a valid email.", Uri:""
Cause

This error typically occurs when the primary SMTP domain (email domain) for the Google Apps Super Admin user being used for the migration does not match the primary SMTP domain for the user(s) being migrated.
Resolution

If there are multiple SMTP (email) domains in use in Google Apps, then a separate Google Apps Super Admin user should be created for each SMTP domain. Users should then be grouped into Migration Plans based off of their SMTP address and the corresponding Google Apps Super Admin user credentials should be used for the migration.