Can’t convert to PDF

I downloaded the current release of Devonthink today, working on a MacBook Pro with Catalina 10.5.5. I indexed some folders with mostly PPTX files and if I choose an item to „convert to PDF…“ nothin happens. I tried to reinstall PDF services (not clear if they’re really installed, there’s no „installed“ sign next to it) but‘s the same. If I try e.g. „convert to plain text“ all is fine. Any idea?

You can’t convert PowerPoint files to PDF in DEVONthink. That must be done in PowerPoint.