It looks like the user account being used on the iPhone SE is missing some required permissions to SharePoint. Is it possible you're using multiple accounts? If so, can you try one of the other accounts on the iPhone SE and see it works fine for the other user account? We suspect the you will have to give permissions to the current iPhone SE user on SharePoint.
Let me know how this goes!
Thanks for your reply.
User with iPhone having issue is having only 1 account configured via intune. User have already reinstalled software multiple times as well as user is configured as site owner to respective sharepoint site.
Your suggestion has worked. I recreated permission of affected user on sharepoint and he was able to access without any error.
Thanks for your help.
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