custom indicators or My indicator

[M.E.A]

Hello friends, the custom indicators or My indicator works correctly in the backtest, but it does not work in the live market on the demo account!!
Has anyone come across this?
Thank you for the guidance

[sktsec]

Have you turned on the EA in live trading?

[M.E.A]

Yes, I have activated it and applied its settings

[sktsec]

Any error message?