"Unknown client" error locally, but same client works in production

I have a situation where login for a protected element of my website works fine on the preview site and production but locally is erroring with the unknown client error. I’ve tried multiple browsers; Firefoc, Brave, Duck Duck Go, ToR, multiple ports; 3000, 5173, 8888 react sdk and raw auth0 requests. I’ve tried a fresh NPM install, I’ve tried npm dev and netlify dev but all produce the same error. What is even more bizarre is the error summary on the logs page provides the application id and the unknown client and they’re identical. The only difference from between when it worked locally and now is I’m using a different Macbook. That’s it.

Anyone else experienced this and does anyone know how the heck I can get it working locally again?

Thanks.