I cannot see any SharePoint Sites in the Content Library
If you're unable to see any SharePoint sites in the Content Library as shown in the below image, there might be a few reasons for this issue. This article lists down 4 ways by which you can solve this issue.
Let us look into these options -
Go to SharePoint and follow the site. Come back to Salesforce and use the followed sites from the dropdown. Followed sites usually work better than All Sites APIs provided by SharePoint.
Make sure you are logged in CloudFiles with the correct SharePoint login. Consider opening Salesforce in incognito mode, then navigate to CloudFiles > Content Library > Log out from SharePoint and log back in. This ensures that you are logged in with the correct SharePoint user.
Additionally, you can try opening sharepoint in a new tab and ensure that you are logged in with the correct sharepoint user. Sometimes O365 user gets logged in instead of the correct sharepoint user which might create issues.
Sometimes creating a folder from SharePoint and explicitly adding share permissions for the desired user will solve the issue. Make sure you have at least 1 folder inside of the site and try adding share permissions explicitly for your user in to it.
Make sure you have access to the folders / sites in SharePoint. Open the SharePoint App and make sure you are seeing Sharepoint folders & site there.
In case the problem persists, please chat with us or write to us. We will get back to you as soon as possible.