I've been going down a rabbithole for a few hours trying to figure this out.
I had great success running it locally, but when I tried to proxy Minio through Traefik it was simply not working, I couldn't get access no matter what I was trying. I eventually enabled debug logging on Traefik and found it was giving me a content refused error.
This lead me to a forum on Stackoverflow recommending to set a Minio container variable for MINIO_SERVER_URL as https://my.domain.com:{Web_UI_Port}.
I have noted that MINIO_SERVER_URL is deprecated but it still worked for me (For now).
Hopefully this helps someone else