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Do you have other campaigns using CloudBurst? If so all authorizations will appear in the drop down as Google only sees the account as a whole and not the campaigns separately. If you are authorizing the correct account and do not see the connections in the drop down, it will mean there are too many profiles in the account (more than 20) or the account does not have full administrative access. Others have been able to import the connections by moving profiles to other accounts. You may have to reach out to Google to verify you are under the token limit to allow more connections.