Can you update a document’s prefill tab after the envelope has been signed once?

Hello ​@Justin Bernard 
Thank you for reaching out, and welcome to the Docusign Community! We appreciate your question and assure you that we are fully committed to providing you with the best service possible.
I reproduced the issue, and unfortunately, the answer is no. You cannot update a prefill tab on a document after at least one recipient has signed it. Once a document is signed, the information is locked to preserve the electronic signature's integrity and to maintain an accurate audit trail. You can just void the envelope and resend it.

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Sincerely,

Ma. Cassandra | Docusign Community Moderator
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Hello ​@Justin Bernard 

How are you? I'm checking in to see if you still need assistance. If yes, kindly reply here with more context or confirm if the issue has been resolved. 

If you run into any problems, we're happy to help with those here. Wishing you a smooth rest of your day!

Sincerely,

Ma. Cassandra | Docusign Community Moderator

If this helped, feel free to Like👍and click "Best Answer"

Hello ​@Justin Bernard 

How are you? I'm checking in to see if you still need assistance. If yes, kindly reply here with more context or confirm if the issue has been resolved. 

If you run into any problems, we're happy to help with those here. Wishing you a smooth rest of your day!

Sincerely,

Ma. Cassandra | Docusign Community Moderator

If this helped, feel free to Like👍and click "Best Answer"