I have numerous Kasa and Tapo devices connected.  I have never had any issues adding new ones.  Since my phone upgraded I cannot get new devices to link.  Everything goes well until I try to connect to the wifi from home.  Then it spins and finally says to try again later.  I surmise something with a vpn may be the issue, but I do not believe a VPN is turned on.  Anyone else had this issue?  If I use my wife's S24+ everything works perfectly.