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Based on my testing, this seems to be the expected behavior. In my test environment, there is no presence information for users inside or outside the organization. To display user status, please use New Outlook, Outlook 365 or Outlook for Web.
Please kindly understand that many functions are not designed at present. In the meantime, I will submit this feedback on the official feedback portal. I have post here, and you could vote for it. If you have any suggestions or ideas, it's suggested that you could post here. Hope Microsoft will notice this in the future.
Thank you for your understanding and support!
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