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Allow synchronisation of files with special characters (like # and %).

Allow synchronisation of files that include special characters in the filenames, like # and %.

Step 1; Download and install the ‘SharePoint Online Management Shell’
link: https://www.microsoft.com/en-us/download/details.aspx?id=35588

Step 2; Open the SharePoint Online Management Shell by searching for ‘sharepoint’ in your startmenu.

Step 3; Run the following command: (replace the values according to the tenant you are connecting to)

$adminUPN="info@iterrors.com"
$orgName="iterrors"
$userCredential = Get-Credential -UserName $adminUPN -Message "Type the password."
Connect-SPOService -Url https://$orgName-admin.sharepoint.com -Credential $userCredential

Enter the password, click OK and press ENTER.

Step 4; Run the following command:

Set-SPOTenant -SpecialCharactersStateInFileFolderNames Allowed

All done, it can take hours or even a couple of days to get the files to sync after the change.