Who collaborates during the Sprint Review?

A Scrum Team has remote team members, after the 15 minute daily Scrum, Developers spend an additional 15-30 minutes every day discussing architectural designs, code designs, code reviews, high priorities bugs, and concerns.
As a Scrum Master, how should you handle this situation?

Which of the following is a measure of the experience that the customer would like to have?

An international bank has a large structure with several levels of management. (Directors, many managers, Delivery Managers, Product Managers, Program Managers, Project Managers, CTO, CTO, etc.). The company has just hired four project managers and a director of operations. This company should not implement Scrum since a large management team does not contribute to the implementation of Scrum and agile methodologies would not benefit the company.

After Sprint 6, Developers say they need to complete the software architecture before they can begin working on the functional requirements.
As a Scrum Master, what is the most appropriate action you can take?