Swapping Honeywell BDR91 Receiver with Tado Wireless Receiver

Folks, an update here. Managed to figure it out in the end, with the help of the tado chat support. Apparently, when my thermostat shipped out with some other configuration (Opentherm I assume), instead of relay mode, so the Support person changed that for me OTA, and lo and behold it works now...

Thanks again to @RandomGrinch and @CBW for the help here!!
 
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