You'll be prompted to grant access to complete the integration.
This gives Dropbox Sign technical access to your OneDrive account so that we can make your files in OneDrive securely available through Dropbox Sign.
If you’re using OneDrive for Business, the OneDrive for Business admin should activate the integration with Dropbox Sign first. After that, all of the other team members can activate the integration with their Dropbox Sign accounts.
If you're a Dropbox Sign Premium user, your team can use team cloud sync to organize all of their Dropbox Sign documents in one place, like Dropbox, Google Drive, OneDrive, or Box.
Learn more about team level document syncing and storage with Dropbox Sign.