@java.lang.Override
    public java.lang.String getClientId() {
      java.lang.Object ref = clientId_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        clientId_ = s;
        return s;
      }
    }
<pre>
The Application ID for the app registered in Microsoft Azure Portal.
The application must also be configured with MS Graph permissions
"Files.ReadAll", "Sites.ReadAll" and BrowserSiteLists.Read.All.
</pre>

<code>string client_id = 1;</code>

@return The clientId.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SharePointSources.java