Will code-based experience work for unknown profiles?

@MYSTERIOUSMAN It should work within the HTML content component as well. Example screenshot below that uses the let function,  

@akwankl Currently it's not possible. You will have to setup a journey to orchestrate that manually combining all of the mentioned channels.

@Deepak_Kv, This is a helpful resource to understand the segment timing.

You will have to add the segment code as a UTM parameter for each URL.

@DataDriven-Em If you want to include the audience segment details use the segment code in the ACS via workflow which will be available in dynamic reporting and also will be part of the delivery logs. Additionally, you can have the segment code in URL tracking. 

Got it. I didn't realize that's just a warning rather than an error.

@MonikaAg, Looks like the issue is with the AJO opt-out landing page on an email not being recognized as an opt-out link. It should be compatible with the one click opt-out or external opt-out type. I would suggest checking with adobe support on this issue.

@MonikaAg In the journey select the email message (welcome email) and click copy and paste the output in Notepad to find the message id corresponding to the welcome email.

If it needs to be near real-time then either use a unitary event type journey allow to the use of experience event data in the conditions or setup an audience criteria that meets the streaming segmentation criteria.