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Hi Sargan_499,
When you use the Office Deployment Tool to deploy Office on your computer, you are only customizing the installation (basically you are choosing which version you want to install and which app you want to include/exclude), you are not making any change in your subscription.
To answer your question “What does that mean, this is a standalone PC with an office 365 license ... not aware of what 'a channel is”, in any Office app that you have already installed on your computer, click File>Account, under version info, you’ll find the channel info (refer screenshot below).
So, you need to ensure that Visio Professional should also have the same channel when you customize the installation, screenshot below for reference.
To know more about the update channel, see Changes to update channels for Microsoft 365 Apps - Deploy Office | Microsoft Docs
To work with the service, go to Office Customization Tool and choose the products, languages, and application preferences you want to configure.
Regards,
Neha