When I create a requisition using the "Buy with a team" feature via Guided Buying, the Request On Behalf defaults the "Team Owner" as the On Behalf of.

This is expected behavior and no matter which team member( team owner or contributor) is creating the PR the headers level information, such as On behalf of, Plant, company code, Purchasing Unit default from the Team owner.

The on behalf of will always be defaulted to the team owner. The On Behalf of field is not editable.

Team requisitions display in the Recent requests page for only the preparer and requester (the team owner). Guided buying notifies only the requester about items to receive, not contributors.

Guided Buying > Guided Buying Requisitioning
Guided Buying > Team Buying & Receiving