Power automate Unauthorized error, 401 "Not authorized to call this engine"

Hi,

I’m trying to use the ‘Adobe PDF services’ from within Microsoft Power Automate.

I have produced a Flow using the example ‘Convert newly added files to text searchable PDF in SharePoint with OCR’. However, the step ‘Create Searchable PDF using OCR’ always fails with the error,

Code:401 Message: "Not authorized to call this engine"

As far as I can tell there is no error with the connector to Adobe PDF Services.

Has anyone got any suggestions?

Thanks,

David