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What to Do When a Platform Rejects Your Signature Due to an "Unaccepted Provider"

Are you trying to sign a document, but the system rejects it with a message stating that your signature is unknown or unaccepted? No need to worry - in most cases, your signature is completely valid. This situation usually happens because the verifying system (such as a public authority or an external platform) does not have an up-to-date database of European providers or cannot properly read the certificate structure.

How to Prove the Validity of Your Signature

If the platform or public authority rejects your document due to an alleged error, the simplest solution is to generate an official proof of signature validity yourself.

Use the Autenti Qualified Validator:

    • Go to the [Autenti Qualified Validator] tool.
    • Upload the signed document. In just a few seconds, the tool will verify its validity and integrity in accordance with EU standards.
    • Download the generated files:
      • Validation Proof (PDF) - A clear summary of the verification result, ideal for quickly sending to the recipient.
      • Validation Report (XML) - A document in the required standard format, serving as undisputed legal evidence with the highest technical standing.
    • Send both files to the public authority or business partner as conclusive proof that your signature must be accepted.

    Why Must the Public Authority or System Accept Your Signature?

    If the other party continues to resist, you can cite specific provisions of European Union law:

    1. The Cross-Border Principle (Article 25(3) of the eIDAS Regulation)

    By law, a qualified electronic signature based on a qualified certificate issued in one EU Member State must be recognized as a qualified electronic signature in all other EU Member States. Every entity (public authority, bank, or private company) is required to use technical solutions that recognize foreign certificates.

    2. The European Trusted List (TSL)

    For a signature to hold the legal status of a qualified signature, its issuer must be listed on the Trusted List (TSL). Every EU country publishes its own list of trusted providers.

    • Polish NCCert List (nccert.pl): Contains only providers registered in Poland.
    •  European eIDAS List: The full list of certified providers from all EU Member States (over 100 entities) can be found on the official European Commission website: [EU Trusted List Browser]. 

    Example: The InfoCert certificate (issued by the Italian company InfoCert S.p.A.) is not listed on the Polish NCCert list because it is not a Polish entity. However, it is included in the official European Union list of trusted providers. For this reason, it must be strictly respected throughout the entire European Union, including Poland.