Hi,
I apologize for not replying in a timely manner.
Please provide additional information to helps you better.
1) Which version of iOS are you working on?
2) Are you unable to delete the recent list in Office 365 for iPhone or on OneDrive app on iPhone?
Let's go to the Office 365\OneDrive App from your device, swipe left and check if get the option
to delete the recent items list.
Hope it helps. Please reply with the status of the issue so that we can help you better.
Thank you.
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