Did you create a meeting using a meeting custom template?
Do you have the required Teams Premium license for Teams meeting templates? Meeting templates are available as part of the preview release of Teams Premium.
What's the version of your Outlook? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version.
As far as I know, Meeting templates are not available on Outlook for Mac or Outlook for web.
If all the above conditions are met, try to create a new Outlook profile and check if there are any differences.
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