Add at least one action before turning this on.
An automation with zero actions would fire and do nothing - this is rejected server-side, not just a disabled button, so it can never be bypassed by calling the API directly either.
Go back into the automation and add at least one action.
Try turning it on again.
Still stuck? Send AVX-3072 to hello@theavoxai.com along with what you were doing when it happened.