@Balraj_Maskale  Yes, the On-Demand Audience referred to under Campaign Orchestration is available immediately and can be used to trigger deliveries in campaigns without delay. JFI.. Importing, activating, and sending deliveries to an audience by uploading a CSV file is already supported. You can re...

Please note that if any functionality falls under limitations or guardrails, it is typically highlighted in the Adobe documentation.

There is no specific limitation on configuring the email channel.

@Michael_Soprano There is a limitation on subdomain delegation, not on email channel creation https://experienceleague.adobe.com/en/docs/journey-optimizer/using/configuration/delegate-subdomains/delegate-subdomain 

@Aditi_Londhe May I know the schema type? is it an event type? make sure _id is unique in the event payload. If it is not unique,  data is visible in dataset, but not reflected in profile. https://experienceleague.adobe.com/en/docs/experience-platform/xdm/classes/experienceevent 

Schema ID in the package can be seen with looking up package API, https://developer.adobe.com/experience-platform-apis/references/sandbox/#operation/lookUpPackage 

I created a package that includes a schema in Sandbox A. After resetting the sandbox (which wiped all resources, including the schema) but not package, I re-imported the same package in  Sandbox A and, surprisingly, the schema was re-created successfully. However, the package only references the sch...

Creating 30 campaigns is a bit of a tedious effort, but if it offers better control and clarity, can proceed with the approach.

@TheFinder try to use event data of profile attributes section to fill dynamic part, do not use contextual attributes.

@TheFinder have you tried replacing the dynamic/variable part of url via the event attribute?