Gewiss chorus-smart zigbee thermostat pairing mode

Hello,
i own an HE C-8 Pro Europe Version, and i have some issues with an Gewiss thermostat-GW14709, cant find a way for pairing mode, the gewiss support doesnt answer to my related issue.
Does someone got this issue ? Any ideas for me ? Thank you for your time.

Looking over the manual and specs for this,, it appears that it wants to be the central hub not an attached device.

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i found this diagram from manual

Hmmmm looks like I may have been mislead..