Remote viewing and the TP Link Deco M5

I have had my TP Link Deco M5 mesh system for almost two years now and never had an issue with remote streaming my Tablo. Last weekend tried to view on my phone outside my house and it didn’t work. I am back home know and trying to fix and I have a Your Router requires Manual Configuration error. With exclamation points by port forwarding. I did recently change from a cable modem internet to Fiber Optics isp. Has something changed or should could the ISP have some kind of fire wall preventing the ports from being available? I can stream my plex server. Thank you for your help.

What is the make and model of the modem that comes with your new ISP? Put that modem in bridge mode.