Due to recent changes by MetaQuotes, copying and multiplying signal subscription trades is now restricted.
You can read about it here:
Terminal: Restricted access to MQL5 trading and history functions if the account is subscribed to a signal.
When a signal subscription is detected on the account (regardless of whether copying is enabled in the current terminal), any MQL5 trading function calls are prohibited, including receiving open orders and positions, receiving history, and performing trading operations.

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Hello,
I have recently copied a signal from MQL MT5. I also have Internal Copier EA to increase my exposure. Like if signal has 0.01 lot size and I want 0.02, then my internal copier would mirror the same trade with 0.01 lot. Recently I noticed that not only internal copier but any EA doesn't work in an account which is subscribed to a signal.
Is there any solution?