If you used Sign in with Apple and chose Hide My Email for Kickstarter, the pledge may use an Apple relay email address instead of your usual inbox address. A relay address is an email alias; it is not your Apple Account password or your Apple Account sign-in address.
1. Find the address used for the pledge
Check the Kickstarter account and pledge confirmation associated with the project. You can also view the address used for Kickstarter under Sign in with Apple in your Apple Account settings.
See Apple’s guide to viewing Hide My Email addresses. Older relay addresses use privaterelay.appleid.com. Apple has also announced private.icloud.com for new Sign in with Apple addresses; use the exact address associated with your pledge.
2. Check the PledgeBox account and invitation
Use the email address associated with the pledge when signing in to PledgeBox. Follow the verification and recovery steps shown by PledgeBox. Do not assume that a relay address is exempt from verification.
Relay forwarding depends on the sender and your Apple settings. A message from a different service may not reach your usual inbox through the relay.
3. If you cannot receive the invitation or verification email
Contact the creator through your original Kickstarter account. Ask the creator to verify the original pledge and help update the order to an email address you can receive mail at.
Do not use a publicly visible PBID or relay address as the sole proof of ownership. Never send an Apple password or verification code to a creator or support agent.
If you can already access your PledgeBox account, use the email-change controls available in your profile and complete any verification they request. If the order remains missing, contact PledgeBox support with the project name and a description of the issue.
For Apple’s announced relay-domain update, see Update: New domain for Sign in with Apple.