On 34xx is AV not supported.

Here is mail from Garmin:

Thank you for contacting Garmin Europe.

Unfortunately that feature was made available and possible on the OEM
BMW branded 3760 and it's not possible on the 3490.

If there is anything else I can help you with then please let me know.
Alternatively you can search for a solution here: [Only registered and activated users can see links. ]

Kind regards,