If user has a permission to the document, it's probably locked for 15 minutes.
User could try rename it after 15 minutes.
Verify also that the document is not open with another user.
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We found the following error displayed when user trying to confirm file name or rename file (see the error message prompt if users not have delete right. (you can update summary field but file name cannot be changed after upload)):
"Access denied. you do not have permission to perform this action or access this resource".
If user has a permission to the document, it's probably locked for 15 minutes.
User could try rename it after 15 minutes.
Verify also that the document is not open with another user.
Sharepoint is not currently supported here on QnA. They're actively answering question in dedicated forums here.
https://social.technet.microsoft.com/Forums/sharepoint/en-US/home?category=sharepoint
--please don't forget to Accept as answer if the reply is helpful--
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows Server] Datacenter Management
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