I had the same issue once. Just contacted my broker and they solved the issue - probably some brokers put some kind of limitation when it comes to trading with expert advisors.

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Hi team
I have this message when I try to place a trade with MT4 Trade Assistant: "Trade by symbol is disabled by the trading server"
I still can place a trade for the same Symbol manually... Never had this problem before with the trade assistant.
How can I fix this?
thanks
Adam