OSC command for fan center

I can't seem to get the OSC command for 'fan center' to work

The OSC syntax I am trying is:

/eos/cmd/fan_/center

But the only posts 'fan' to the command line.

When I do the same syntax:

'fan_ center'

In a magic sheet button, set to target=command, it works fine...

Is there something obvious that i'm doing wrong?

I'm sending the OSC from touchOSC on my phone.

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