You cannot trade a symbol and it says the market is closed.
The instrument is outside its session hours.
Every symbol has session times set by the broker and stored in its specification, and MT4 disables order entry outside them. Those times are expressed in the broker's server time rather than yours, so an instrument can appear closed at what looks like the wrong moment until you account for the offset between the server clock shown in Market Watch and your own.
Different instrument classes on the same account run different sessions. Forex runs continuously through the week with a short daily break, indices and commodities follow their underlying exchange hours with their own breaks, and shares follow the exchange calendar including public holidays. A single exchange holiday can therefore close some of your symbols while the rest trade as usual.
Open the symbol specification from Market Watch, read the trading session times listed there and compare them with the server clock rather than your computer clock. When the session opens the quotes begin moving and the order dialog will accept a market order for that symbol.
Check session times in the specification before planning a trade on an unfamiliar instrument, remembering they are in server time. Ask your broker for their holiday schedule if you trade indices or shares, since those closures are set by the broker and are not shown in the platform in advance.
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