NemID and the Danish Government have their own PDF whitelist that you must adhere to. Any PDF that includes elements not on the whitelist will cause the signing order to be rejected.
You can read more about this here in the NemID implementation guidelines (section 5.4.2) but at this point there is no way for you to pre-validate a PDF to ensure compatibility
You can use an online validator tool to make sure that your PDF adheres to the PDF/A standard, but that is still no guarantee that it will work with NemID.
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