@David-TP the Samsung S10 is not added to any Parental Control, the Tp-link is new and I never configured it. And wan subnet mask is 255.255.255.0. i might try changing dns first. The S10 also shows...

I have an internet modem provided by my ISP, that was connected to a competitors mesh system (8 years old, Wifi 5). The "main" mesh system node failed, so I replaced it with a TP-Link Deco BE65 as a...