Turns out my local environment just had a bad DB connection string, but that wasn’t previously showing itself because there was something cached in the browser. After being logged out of one environment (when trying to switch to dev), it was never actually making a request to my development issue before kicking me out. It wasn’t until I tried another browser (and subsequently cleared cache in the original browser) that it actually called my local environment.
What would have been cached in the UI that would have prevented my local environment from being called?