If you have access to all of the proofs, my advice is to go to the Proofing page from main menu and then select the proofs you're looking for and click the Share icon to add the people that way if you don't want to create a proof workflow and then apply the workflow to these proofs. Example from my Proofing - select the proofs from main Proofing page then Share (person icon):
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Then add the people:
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If you found this helpful, please mark correct to help others : )
If this helped you, please mark correct to help others : )