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I have a few steps that you can follow, pcdistributing.
You can update the contractor's email address by following these steps:
Here's a sample screenshot for a visual guide:
Once done, go to Workers > Contractors. Then, select the contractor's name and click the Send email link. This is to invite the contractor again so they can view their 1099-MISC form.
Please keep me posted if you have any other questions or concerns. Have a great day!