Server Version#: 1.43.4.10903
Player Version#: Web 4.160.0
Looking at the Settings/Remote Access, it looks like PMS tests the server’s ULA address (in the fd00::/8 range) instead of its GUA (from 2000::/3) address if it has both. And then, unsurprisingly, displays that the server is “not available outside your network”.
(server is IPv6-only, secure connections Required, strict TLS, no custom server access URLs)
