The team is not going to complete its Sprint Commitment. As Team Facilitator, what should you do?
advise the PO as soon as possible
Ask the PO to extend the sprint Sprints cannot be extended. The Scrum Guide is pretty clear on this: you don't extend sprints. At the end of a sprint, if there is incomplete work: "All incomplete Product Backlog Items are re-estimated and put back on the Product Backlog."
point out the reasons why and collaborate on solutions
report this at the Sprint Review