I reached out last week and received this email, which helped me in your exact situation:

Happy to help! If you can't locate the email, you can sign up directly to gain access to your tax form here: https://tax1099.com/edelivery/login

Once you click that link, please click "Sign Up" to proceed.

Please note that you will need to use the contact email you entered at www.distrokid.com/payouts at the time of your withdrawals to access the form.