setChannelVariable CHANNEL_ICON_ID impossible to change ID

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Hi, I'm going crazy trying to change the icons of my channels with C, I am an admin server, so permissions shouldn't be a problem. I can change the names, move channels, and everything using setChannelVariableAsUInt64 or setChannelVariableAsString, but i don't know what to do with icons, i have... setChannelVariable CHANNEL_ICON_ID impossible to change ID