Hi, is the shared mailbox configured to cache downloaded folders?
If so, uncheck that option in Outlook and restart Outlook and search again:
https://support.microsoft.com/en-us/topic/performance-and-synchronization-problems-when-you-work-with-folders-in-a-secondary-mailbox-in-outlook-d45e5881-3d32-ca00-6338-5962cfc41ea8
Hi @Pam Taylor-Smith
Do you have any other concern about this issue so far? You could share any update here when you are free.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.