I have enabled Fast Roaming (802.11r) in the Deco app however my Galaxy S23+ phone shows that this protocol is disabled as seen in the picture below.

This Article Applies to: Deco BE65(US/AU/CA/EU)_V2.0/2.6 Deco BE63(US)_V2.6 Deco BE11000(US)_2.6 Deco BE65 Pro(US/AU/CA/EU))_V1.0/V1.6 Modifications and Enhancements: Boosted Mesh Roaming Performance

I just recently got a BE65 and I was shocked to see that 2.4ghz MLO is not supported (even though the hardware allows it). I have spots in my house that drop to 2.4ghz only and if I use the MLO networ