It can be many problems.
You can look at the logs/journal of Metatrader (or logs/journal of MQL5 VPS if you are using it) to know about which problem.
And check subscriptiopn procedure once again in case you missed something:
---------------
How to Subscribe to MT4/MT5 Signal - new instructions
https://www.mql5.com/en/forum/189731 (MT4)
https://www.mql5.com/en/forum/336422 (MT5)

- 2017.04.10
- www.mql5.com
me too
Forum on trading, automated trading systems and testing trading strategies
Sergey Golubev, 2020.09.03 06:28
It can be many problems.
You can look at the logs/journal of Metatrader (or logs/journal of MQL5 VPS if you are using it) to know about which problem.
And check subscriptiopn procedure once again in case you missed something:
---------------
How to Subscribe to MT4/MT5 Signal - new instructions
https://www.mql5.com/en/forum/189731 (MT4)
https://www.mql5.com/en/forum/336422 (MT5)

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I have two accounts attached to two different traders, one works without problems and the second does not work copying.
What could be the problem?