You should look at Metatrader journal/logs (or in MQL5 VPS journal in caseyou are using MQL5 VPS) about what was written there.
If it is written something as "..no symbol found" error so it is mapping.
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Sergey Golubev, 2021.03.15 14:28
"... no symbol found" is related to the mapping.
It is standard feature of Signal service (it means that your broker is very different by symbols from the signal provider's broker).
read this short thread for more details: https://www.mql5.com/en/forum/364322
tienthan2017:
Do not double post!!
I have deleted your duplicate post!

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Hi Everyone,
My MT4 account is copying trades from a host, but for some reasons it copy all trades except for XAUUSD. Can someone let me know how to fix this issue please?
Thanks