Bug Report: MCP SharePoint in Agent Builder Does Not Function With Application-Only Sites.Selected Access
`Steps to Reproduce`
Register an Azure AD app with:
Delegated: User.Read
Application: Sites.Selected
Grant the app Sites.Selected access to a single SharePoint site (no Sites.Read.All).
Confirm the app-only token works via Graph API (e.g., list drive items in Postman).
In Agent Builder, configure MCP SharePoint using the app credentials (client ID + secret/cert), not a delegated token.
Build a flow that lists/searches files using the MCP SharePoint connector.
Run the flow.
`Expected Result`
MCP SharePoint should list, browse, and search the specific site granted through Sites.Selected.
`Actual Result`
MCP SharePoint fails to list or browse files.
Search and indexing do not work.
Flow breaks when using the app-only token, despite it working correctly in Graph/Postman.
`Environment`
AgentBuilder with MCP SharePoint
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