@Laskewitz may be the man for this but here is some detail.
This works for me in my tenant but there are several posting in the Forum reporting issues, please see links below:
This seems to be working now but only if you pick the file manually from the file browser.
In my case when you pick the input for File is set to /test.docx
If you pass /test.docx from variables it does not work.
I have tried to create a simple flow action to convert a SP Word document to PDF, but stumbled upon this.
I used the standard template for Microsoft Flow to perform an action "for a selected document".
It fails at the "Convert to PDF" step 100% of the time.
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