No – a unique password for each signer is not mandatory, and you can assign the same password for every signer.

To enhance security, however, the best practice is to assign a unique code to each signer.

Click Here To Learn How To Set An Access Code

*Note:  If two or more signers use the SAME email address to sign the document(s), assigning a unique Access Code to each signer (and notifying each signer of that unique Access Code privately) is critical in ensuring enforceability*