Fix Acrobat Sign Could Not Send Error When Routing PDFs
Question details
Users encounter a 'Could Not Send. An error has occurred' message when attempting to route a PDF document to an approver or signer.

- Product
- Adobe Acrobat Sign
- Device & OS
- not provided
- Scenario
- Sending a PDF document for approval or signature using the Fill & Sign or Request Signatures feature.
- Observed behavior
- The system fails to send the document and displays a generic error message, often triggered after switching the document repeatedly between interactive form and Adobe Sign form modes.
Ensure you have a stable internet connection and verify that your specific Adobe account tier supports the 'Approver' role in document workflows.
Recreate the Document and Avoid Mode Switching
Switching between Acrobat interactive forms and Acrobat Sign forms can corrupt the document's form field metadata. Starting fresh with a new file often resolves the sending error.
When a document is toggled repeatedly between a standard Acrobat interactive form and an Adobe Sign form, hidden background tags can conflict and prevent the Acrobat Sign servers from processing the request.
Open the original source file (like Word or Excel) and export a brand-new PDF document without any legacy form fields.
Open the new PDF in Adobe Acrobat and select 'Request Signatures' directly from the right-hand tools pane.
Enter the email address of a single test recipient, setting their role to either 'Signer' or 'Approver'.
Add your signature and text fields directly within the Adobe Sign interface. Do not convert the document back to an interactive form.
Click 'Send' to verify if the fresh document bypasses the error.

Verify Account Permissions and Approver Roles
The error may occur if your account plan or the current document workflow does not authorize the 'Approver' role.
Sign and Share PDFs Seamlessly with WPS Office
Skip the complex form mode conversions and server errors. WPS Office provides a straightforward, highly compatible PDF tool to add signatures, fill forms, and share documents with ease.
- 1. Open your PDF: Launch WPS Office and open the PDF document you need to sign or fill.
- 2. Access the Fill & Sign tool: Navigate to the 'Fill & Sign' or 'Protect' tab located on the top toolbar.
- 3. Create your signature: Click 'Create Signature' to easily draw, type, or upload an image of your signature.
- 4. Place and save: Click anywhere on the document to place the signature, resize it as needed, and save the file.
- 5. Share with recipients: Use the 'Share' feature to instantly send the signed PDF to your recipients via email.

Frequently Asked Questions
Why do I get a 'Could Not Send' error in Acrobat Sign?
This generic error typically occurs due to corrupted form fields from switching repeatedly between interactive and Sign modes, unsupported approver roles, or temporary server sync issues.
Does the recipient need an Adobe account to sign or approve the document?
No, standard signers and approvers receive a secure email link that allows them to view, approve, and sign the document directly in their web browser without needing to register for an account.
How do I fix form field corruption in a PDF?
The most effective method is to create a clean copy of the PDF from the original source file (like Word), remove all existing legacy form fields, and recreate the signature blocks directly using the 'Request Signatures' tool without toggling back to traditional form modes.




