What is the difference between the Share Sign Up Link on my Businesses tab and a source channel link?

Your Share Sign Up Link is the one you send to clients. Find it under Businesses in the sidebar, then Share Sign Up Link in the top right corner. Anyone who signs up through it is connected to your account and lands in your business library automatically. Source channels sit on top of that: you create one per referral partner, campaign or website button so you can see where each signup originated, and a source channel link still takes the client to the same intake form. If clients are not reaching the intake form, check that you copied the link from Businesses rather than from a channel you were still in the middle of setting up.