I ended up changing from checkboxes to multiple groupings of radio buttons.

​@JacobusN , how did you capture the radio button values in power automate?  

In this example I have a single signer role. You would use a function and build the expressions like

triggerBody()?['data/envelopeSummary/recipients/signers']?[0]?['tabs']?['Gender']

In this example my Radio Data Label is ‘Gender’ and it will return the value of the selection radio button.

Check this Support doc for additional information.

https://support.docusign.com/s/document-item?language=en_US&bundleId=gqy1619537336307&topicId=ayq1621896734683.html&_LANG=enus#:~:text=on%20an%20envelope-,Extract%20custom%20field%20and%20tab%20contents%20using%20Microsoft%27s%20Workflow%20language,-To%20access%20envelope