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Support multiple email proxyAddresses for Webex scheduling and meeting sync

With Webex meetings if someone is invited to a meeting, it will actually sync through Webex and populate on all clients (even without local Outlook scraping enabled). The caveat here is the email address needs to match their Webex email, which in some cases is their SSO username ( and not their published email address.

When entering emails in Outlook, using auto-match (Ctrl + K) or GAL entries, Outlook populates the the user’s primary (default) SMTP address which is often rather than

In this case, because Webex has no record of the primary SMTP address, the meeting will not sync across the Webex platform, nor does it allow setting of alternate hosts.

  • Sean Scott
  • Oct 18 2020
  • Future consideration
  • Oct 24, 2020

    Admin response

    We understand the request and plan on fixing. This requires some amount of work.

    As a workaround, we strongly recommend that organizations sync users with their primary Default SMTP proxyAddress or mail attribute from AD instead of their UPN. Depending on the IdP the SSO SAML contract can be updated to provide Webex with the user’s primary SMTP address instead of the Then all of the back-end systems of Webex will be able to use the user’s default SMTP address instead of seeing their UPN.

    We have successfully accomplished this conversion with many customers. Just requires careful planning, communication to your end-users, and coordination.

  • Guest commented
    26 May, 2021 01:00pm

    We need this sooner rather than later.

  • Wade Hunter commented
    20 Oct, 2020 01:35pm

    Yes please! This has been a big issue for my company.