I'm trying to play Omnifactory with AE2 channels turned on, and when I try to configure a P2P tunnel by shift-right-clicking with the Memory Card, it says "Memory card cleared," and when I right-click, it says "Invalid machine."

Do I need to change any other settings in the configs to get channels to work right? I also want to use P2P tunnels to transport redstone signals.

The only relevant config option is toggling channel mechanics on or off. We have it off by default, but everything works fine if you turn it on.

Please refer to the mod's documentation for use (e.g. here), or ask general help questions like this in Discord.

99% of the time this is caused by having something in your offhand