Ford Transit mk8, 2017, rear speakers

[Lavrenc]

Hello to everyone. Please, someone can help me with the activation of the rear speakers in Sync3 radio? I have Ford Transit 2.0 EcoBlue 125 kW AWD, model 2017, L3H2. The cables were already stretched from the manufacturer (from the radio to the cargo space, all measured). Despite Forscan, I managed to set the front and rear speakers to the radio, but they do not play back. Now I can't find out how to activate them on the radio. I have radio with navigation, see photos.
Please help, advice. Thank you Tom.

[Blizz]

So, did you activate the 6 speaker option on FORScan or not?

My 2022 van wich is a Kombi had the rear speakers from stock, option activated in FORScan is that, 6-speakers (FR Tweeters + FR Speakers + RR Speakers).

Cheers,

David