get https://{subdomain}.peakon.com/api/scim/v2/Users/
Returns a provisioned user by their unique identifier. The identifier in this case is the internal Peakon ID of the user returned in the response of the Create user operation.
If you wish to retrieve the user by externalId instead, consider using the Get all users operation and filter by externalId, which would have been provided when the user was first created/provisioned.