In pull request #3989, we set the conflict resolution behavior for creating new items to be "Replace". While this worked for OneDrive, SharePoint apparently is case-sensitive and expects "replace". Since the default behavior is to replace, we will simply remove the specification to avoid possible conflicts. See the forum discussion below: https://forum.duplicati.com/t/bad-request-error-from-request-nameconflictbehavior-must-be-fail-replace-or-rename/8578