I just started receiving this error when loading the script in our development environment.

Uncaught Error: Invalid client-id for production: AZDxjDScFpQtjWTOUtWKbyN_bDt4OgqaF4eYXlewfBP4-8aqX3PiV8e1GWU6liB2CUXlkA59kJXE7M6R

I'm using the following script src address:

https://www.paypal.com/sdk/js?disable-funding=credit,card&client-id=sb

My understanding of the recent documentation is that the environment is determined from the client-id now, and that sb is a valid sandbox id.