And just to clarify, it's been added to your subscription, correct? Your package.xml file (assuming this is a package.xml-based subscription as I see on in the original screenshot) has something like the following in it?
<types>
<members>GuidedAgentFlowUpdates</members>
<name>LightningMessageChannel</name>
</types>
If not, please add it to your subscription. An easy way to do that is to right-click on either the "messageChannels" folder or the "*.messageChannel" file itself and then click Illuminated Cloud>Add to Metadata Subscription.
If that doesn't resolve the issue, please provide a screenshot of the deployment dialog so I can see how it's configured.
Regards,
Scott