Could be a cache issue.
Try creating a new Outlook profile:
https://support.microsoft.com/en-us/office/create-an-outlook-profile-f544c1ba-3352-4b3b-be0b-8d42a540459d
you can also switch to online mode:
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I recently downloaded Windows 11 and am finding the certain emails are disappearing. today, I had an email come through to my phone and is on my online outlook box, but is not in my Desktop Outlook.
Why is this happening and how can I get the issue resolved?
Could be a cache issue.
Try creating a new Outlook profile:
https://support.microsoft.com/en-us/office/create-an-outlook-profile-f544c1ba-3352-4b3b-be0b-8d42a540459d
you can also switch to online mode: