When I call SharePoint Online REST API to lookup a list item any values returns that contain umlauts are substituted for questions marks (?)
this is the URL i tried
e.g. https://<tenant>.sharepoint.com/sites/<sitename>/_api/lists/getbytitle('<listname>')/items?$select=Title,Id,Hashcode,Filename,Title/Title&$filter=(guid eq '62f0ff31-3d20-478a-a0d7-19f2d5709e71')
e.g EU-Konformitätserklärung_de,en.pdf is returned as EU-Konformit?tserkl?rung_de,en.pdf
What am I missing?