PDF Security & Access Issues

How to Troubleshoot Code 100 for Digital Signatures in Acrobat

Tauseeq Magsi Oct 18, 2026 869 views

Question details

The user wants to access Code 100 to process digital signatures on corporate documentation.

How to Troubleshoot Code 100 for Digital Signatures in Acrobat

Product: Adobe Acrobat
Device & OS: not provided
Scenario: Attempting to apply or access corporate digital signatures on pre-processed company documentation.
Observed behavior: The user is unable to proceed with the digital signature process, potentially due to utilizing a mobile device which does not support full digital certificate signatures.

Before you start

Ensure you know whether your company requires a certified cryptographic 'digital signature' (which uses a certificate ID) or a standard 'e-signature,' as device compatibility differs significantly.

Solution 1Recommended

Use the Desktop Version of Acrobat for Certificate Signatures

Full digital signatures requiring certificates are not supported on mobile devices and must be executed on a desktop operating system.

Cryptographic digital signatures provide a high level of security by embedding a certificate into the document. Because of the secure storage requirements for these certificates, mobile PDF applications generally do not support them.

Transfer the document

Move the pre-processed company PDF document from your mobile device or cloud storage to a Windows or Mac computer.

Open in Acrobat Desktop

Launch the desktop version of Adobe Acrobat and open your target document.

Access the Tools menu

Navigate to the 'Tools' tab at the top of the screen and select the 'Certificates' option to use full digital signatures.

Select your Digital ID

Click 'Digitally Sign', draw the signature box where required, and choose the specific corporate Digital ID or hardware token provided by your company.

Use the Desktop Version of Acrobat for Certificate Signatures

Mobile Limitations: Mobile versions of Acrobat only support standard electronic signatures. You cannot access or apply secure cryptographic digital signatures via the mobile app.

Solution 2

Apply Standard E-Signatures on Mobile Devices

If your company processes accept standard electronic signatures instead of cryptographic digital signatures, you can easily use the Fill & Sign feature on a mobile device.

Free Microsoft Office alternative

Manage and Sign PDFs Easily with WPS Office

If you are struggling with complex Acrobat signature processes or mobile limitations, WPS Office provides a lightweight, fully compatible, and free alternative. You can seamlessly view, edit, and apply electronic signatures to PDF documents across all your devices without hassle.

Fully compatible with standard PDF formats and all major Microsoft Office file types.Built-in PDF editing and electronic signature tools for quick document approval.Lightweight installation that doesn't consume excessive system resources.Cross-platform support allowing you to review and sign on desktop or mobile seamlessly.

microsoft office alternative - wps office

Frequently Asked Questions

What is the difference between a digital signature and an e-signature?

An e-signature is a visual digital representation of a handwritten signature used to show intent. A digital signature uses cryptographic certificates (Digital IDs) to verify the signer's identity and ensure the document has not been altered since it was signed.

Can I use hardware token digital signatures on my Android or iOS device?

Generally, no. Most mobile PDF applications do not support hardware tokens or certificate-based digital signatures due to OS security constraints. You must use a desktop computer for these workflows.

Why does Acrobat ask for a Digital ID when I try to sign?

You likely clicked the 'Certificates' tool instead of the 'Fill & Sign' tool. The Certificates tool requires a cryptographic Digital ID configured on your system. If you only need a visual electronic signature, switch to the 'Fill & Sign' option.

Does WPS Office support PDF signatures?

Yes, WPS Office includes a robust built-in PDF editor that allows you to easily insert electronic signatures, type text, and fill out PDF forms across both desktop and mobile platforms.

PDF Troubleshooting