Universal Containers (UC) uses Salesforce to allow customers to keep track of the order status. The customers can log in to Salesforce using external authentication providers, such as Facebook and Google. UC is also leveraging the App Launcher to let customers access an of platform application for generating shipping labels. The label generator application uses OAuth to provide users access. What license type should an Architect recommend for the customers?

Universal Containers (UC) operates in Asia, Europe and North America regions. There is one Salesforce org for each region. UC is implementing Customer 360 in Salesforce and has procured External Identity and Customer Community licenses in all orgs.
Customers of UC use Community to track orders and create inquiries. Customers also tend to move across regions frequently.
What should an identity architect recommend to optimize license usage and reduce maintenance overhead?

An identity architect wants to secure Salesforce APIs using Security Assertion Markup Language (SAML). For secunty purposes, administrators will need to authorize the applications that will be consuming the APIs.
Which Salesforce OAuth authorization flow should be used?

Universal Containers (UC) wants to use Salesforce for sales orders and a legacy of system for order fulfillment. The legacy system must update the status of orders in 65* Salesforce in real time as they are fulfilled. UC decides to use OAuth for connecting the legacy system to Salesforce. What OAuth flow should be considered that doesn't require storing credentials, client secret or refresh tokens?

A group of users try to access one of universal containers connected apps and receive the following error message : "Failed : Not approved for access". what is most likely to cause of the issue?