How to setup a new supplier for Self Service procurement in B2B messaging for punchout

Summary:

We created a new supplier, the URL connection was successful but the Punchout request are empty on the suppliers side. I think this is because they need to be setup in B2B messaging but I am not sure how to do so. I notice that all other suppliers have this setup.

I read about completing a registration on behalf of the supplier but I am not sure this is the correct way to go. Please advise.

Supplier Registration Process
I am trying to get the new supplier in the list below to select (the prior suppliers are here but not the new one)