Hi @MickaelJRPerrier,
Welcome to the Affinity Forums
Unfortunately I'm not personally aware of the specifics with the PDFlib library that Affinity uses for exporting to PDF and whether this should be supported, however I can certainly see that the files exported aren't being correctly interpreted by the ATS scanning software currently, my apologies for this.
I will be logging this with our development team now to see if this can be improved in a future update, as in none of my testing currently have I been able to export a compatible file from Affinity using different PDF export settings.
I hope this helps!
