FYI: OpenStreetMap seems to be blocking the site with a 403 error (suggesting maybe it's pulling too much data from OSM's servers?): https://wiki.openstreetmap.org/wiki/Blocked_tiles
This recently came across my radar as Home Assistant has migrated to the vector tiles hosted directly by OSMF for all deployments: https://github.com/home-assistant/frontend/pull/53816
For my own needs I usually just go for https://openfreemap.org/ though, I like the default style, and it feels maybe a little faster.