Getting a 401 HTTP Error - What's Causing It and How Do I Fix It? or Why Am I Seeing a 401 HTTP Error

OP here—thanks for all the suggestions! Tried the JWT.io trick and yep, my token was expired. Rotated it and boom, fixed.

Weirdly, Chrome was caching the old one. Hard refresh (Ctrl+F5) did the trick.

You all rock! 🙌