Facebook using wifi

Update: I just notice that Facebook on my Samsun tablet connects just fine. It is some interaction between my Orbi and my Samsung S7 and S9+ phones. Also visitors to our home have a similar problem with their phones if they use our WiFi. Works fine using other WiFi providers like Starbucks or Optonline from Cablevision.

I have done the full reset etc. of the routers. All worked fine with my prior Netgear blackhawk router.