public java.lang.String getClientId() {
        java.lang.Object ref = clientId_;
        if (!(ref instanceof java.lang.String)) {
          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          clientId_ = s;
          return s;
        } else {
          return (java.lang.String) ref;
        }
      }
<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