Unable to subscribe to IoT Secure Tunnel notify topic

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Describe the bug To use AWS IoT Secure Tunneling one needs to subscribe to the topic $aws/things/thing-name/tunnels/notify as per https://docs.aws.amazon.com/iot/latest/developerguide/agent-snippet.html. The SDK refuses to allow this and throws the error cannot subscribe to topic array since one of them is a reserved topic '$aws/things/thing-name/tunnels/notify' instead.

SDK version number 2.2.6 (latest available via npm)

Platform/OS/Hardware/Device Embedded Linux, nodejs 10.15.2.

To Reproduce (observed behavior) Attempt to .subscribe('$aws/things/thing-name/tunnels/notify')

Expected behavior The subscription request should be actioned, not rejected.

Logs/output See above.

Additional context Migrating to the aws-iot-device-sdk-v2 is not currently an option.

[jmklix]

@jmattsson I am checking with IoT product management to get further clarification on what the expected behavior is.

[github-actions[bot]]

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