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MetaTrader 5 build 6140 - MCP internal server returns 401 Unauthorized with generated API key

Hello, I am seeing a reproducible MCP authentication issue in MetaTrader 5 build 6140. Environment: - MetaTrader 5 build 6140 - Windows - Portable MT5 installations - Internal MCP server enabled - Localhost endpoint only - Tested with multiple independent MT5 instances - Also reproduced with a