Check if your Unturned server is online
Unturned answers Steam queries on a port calculated from its game port, which trips up anyone who forwards only the number from the config.
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The ports Unturned uses
It uses a short block of consecutive UDP ports beginning at the configured game port, and the query comes back from one of the higher ports, not the base one. Forward a single port and you have a server that can be joined directly and seen nowhere else.
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Still offline? Try this
Forward the full range, not a lone port. Still failing? See whether the server was launched in LAN mode rather than internet mode; in LAN mode it never replies to outside queries, no matter what the router is doing.