[MM3-users] 502 bad gateway when unsubscribing users

Hi everyone,

I moderate several email lists for a university using Postorius 1.3.4.1. I've been trying to update our lists by removing members who have left the department. However, when I click on a name and then "Unsubscribe Selected," I always get a 502 Bad Gateway message, and I'm unable to remove any users from the list. This has happened on every attempt across multiple users on multiple mailing lists. Does anyone know what might be going on? I appreciate the help!