Self-hosted openHAB Cloud shows login popup (HTTP Basic auth prompt) – Docker + NGINX

Hello everyone,
I’ve been trying to set up a self-hosted instance of openHAB Cloud behind NGINX using Docker, but I’m encountering an unexpected issue:
Every time I access the domain in a browser, I get an HTTP Basic Authentication popup (username/password modal), even though I haven’t enabled any authentication in NGINX or in the app