When accessing staffMember through appbridge, an error message is returned, "Limited access"

Our application is a private application installed under shopify plus.
When I try to get “StaffMember” through the app bridge, the returned information is “Limited access”. The following documents are for my reference
https://shopify.dev/docs/api/app-bridge/previous-versions/methods

Hi - when you say:

When I try to get “StaffMember” through the app bridge

Can you describe exactly what you’re doing?