MT5 10027 or 10026? Find the next step
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The two codes point to different places. Read the exact return code in Toolbox → Experts or Journal before changing settings.

10027 — client terminal
For an EA you intend to run, check the platform’s Algo Trading permission and that EA’s own “Allow Algo Trading” setting. The toolbar button and the similar option in Tools → Options → Expert Advisors control the same platform permission; they are not independent extra switches.

10026 — server
The trade server has disabled automated trading. Ask your broker to check the restriction for the account. Changing a terminal switch does not remove a server-side block.

Useful support details
For setup help, name the error code and whether MT5 runs on your computer or a VPS. Describe what you tried in your own words. Keep account details and credentials private; a plain-language description is enough.

The complete setup
Permissions are one part of the setup. The terminal also needs the intended EA attached, valid configuration, a broker connection and the required activation. A permission check alone does not establish that an order has filled.

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Official references
https://www.mql5.com/en/docs/constants/errorswarnings/enum_trade_return_codes
https://www.metatrader5.com/en/terminal/help/algotrading/trade_robots_indicators