Yes, I did try this and it didn't help. I also should add that I am able to connect locally and control my lights, just not remotely through the portal and by extension through alexa. The TMobile router does not have a bridge mode, but I was able to use one of its ethernet ports to connect to my original asus router's ethernet port configured as a WAN. I then reconnected my wired network to the asus router and everything wired and wireless was working through the Asus router except the ISY portal. I went back to the Tmobile router and turned off all security and wireless and every was still working off the asus router, but again the ISY portal remained offline. I used an older router reset to factory settings connected to my still active cable modem, and plugged in my Isy box. The isy portal came right back online. I do want to keep TMobile home internet because of the $50 per month unlimited access, and the decent speed it has, but it needs to be compatible with the ISY portal. I am hoping for a timely solution to the incompatibility with the ISY portal.
Guy