Do Not Have Permission to Access the Files - How Resolve this Error Message?

Hi Philip, 

Welcome to Box Community and glad to help! 

There are two ways that you'll encounter this error when accessing a shared link: 

             A) The shared link URL that you're accessing has expired. 

             B) You have insufficient permission to preview the content in this shared link. 

If it's the latter, kindly contact the owner/sender of your shared link and ensure that the correct access control was set: 

• People with the link (public/open) - Anyone with the link can access the item and no Box account is required.
• People in your company - People within your same Box enterprise, and people who have a Box account with the same email domain, can access content.
• Invited people only - Only people who have been invited to the item (folder or file) can access the content.

Let us know if you have questions, 

Have a good one!