Yes, it is possible to use the Portals Web API to retrieve all contacts who have the "Administrators" role.
In Dataverse, the relationship between contacts and web roles is represented by a many-to-many relationship using an intermediate table: contactroles_association.
The base URL for the Portals Web API: - https://yourportalurl/_api/contacts
Use $filter and $expand to get contacts with the "Administrators" role: - GET https://yourportalurl/_api/contacts?$expand=contactroles_association($filter=webroleid eq 'WebRoleIDForAdministrators')
Go to Portals Management App. Navigate to Web Roles and locate the "Administrators" role. Copy the GUID of the "Administrators" role (e.g., b1234567-89ab-cdef-0123-456789abcdef).
If the GUID for the "Administrators" role is b1234567-89ab-cdef-0123-456789abcdef, the API call - GET https://yourportalurl/_api/contacts?$expand=contactroles_association($filter=webroleid eq 'b1234567-89ab-cdef-0123-456789abcdef')
Check whether Web API enabled or not
Navigate to Power Platform Admin Center > Portals > Settings. Enable Portals Web API.
Set appropriate permissions for the Contact table: Navigate to Portals Management App > Entity Permissions. Create or update permissions for the Contact table to allow Read access for the required web roles.
now test API with postman - hope this helps.
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