I'm trying to create a new folder, I get an error message, cannot create folder , please advice

I'm trying to create a new folder, I get an error message, cannot create folder , please advice

Hi @AhmedSaleh-7897 , welcome to Q&A forum!
This is the default behavior of SharePoint. Folder names can't include: " # % * : < > ? / |
==========Update1======================
Does the issue exists in other libraries? Try to create folder and compare the results.
If the issue just exists in one library, check whether the library has unique permission, make sure the users has at least contribute permission on the library.
Similar posts for your reference:
Not able to create Folder within document library OOB Office 365
Sharepoint Online Folder Creation issue
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Hi @AhmedSaleh-7897 ,
Sorry for the misunderstanding. I have update my answer, kindly check the Update1 section. Any updates can be post here to share with us.
Hi @AhmedSaleh-7897 , how are things going? Is there any update on your issue? In addition, is there any custom code in the library?
Nothing, same problem no there any custom code in library.
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