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For anyone who runs into this error, I finally got it fixed -- but not by changing the configuration of my redirect URL. My problem was the Cross-Origin-Opener-Policy header on the web server -- and the tech with access to that changed it to allow "same-origin-allow-popups" In regards to the redirect URL itself, since I am using a one-page React App for my website I just have it like the following: https://www.mysite.com/ (The ending slash seems to be a must...) To set it in your Apple Developer account, go to "Certificates, Identifiers & Profiles" --> then choose "Identifiers" in the left hand menu --> then select "Service IDs" over on the top right. (The default is "App IDs") From there you can add or edit your Sign In with Apple configuration, including the URLs...

This ended up being a mess, so I opened a new question that should be easier for someone to help me with.

Try this: https://developer.okta.com/blog/2019/06/04/what-the-heck-is-sign-in-with-apple