What is what channel is not included in the default channels report?

As an AI language model, I don't have access to your default channels report. However, in general, the channels that are not included in default channels report can vary depending on the tool or platform you are using. Some possible channels that may not be included in default channels report are:

1. Referral traffic from social media platforms (e.g. Instagram, Snapchat)
2. Direct traffic from instant messaging apps (e.g. WhatsApp, Facebook Messenger)
3. Offline channels (e.g. billboards, radio ads)
4. Non-traditional digital channels (e.g. podcasts, influencer marketing)
5. Organic search traffic from niche search engines (e.g. DuckDuckGo, Bing)

It is important to review and customize your channels report based on your marketing strategy and goals. You can usually add or exclude specific channels from your report by adjusting the settings or filters within your analytics tool.