Port forwarding and very questionable phone support behavior

I've spent the past 3 hours attempting to what is normally a 5 minute deal with most hardware; set up a range of ports to forward. At this point I'm almost completely positive this is a known issue not just by the community at large but by Xfinity phone support as well.

>Attempted to configure using gateway GUI; given message and redirect to Xfinity webpage for port forwarding.

>Webpage no longer exists, redirects to install and use mobile app (woe to those who don't have a mobile phone I guess)

>Attempt to use app for forwarding, location for port forwarding very difficult to find. Once found, redirects in endless death loop of "Opps something went wrong"

>First contact with chat customer support, without even missing a beat, when asked about port forwarding copy+pastes how to put a device in DMZ mode. At no point do they include all the risks associated with putting a networked device into DMZ. Clearly this techs 'work around', ask to speak to escalate. Says a supervisor will call me shortly, another -tech- calls me, tells me the same thing, I ask if they're a manager and they say no, I need to call the 800 number for that.

>Look into 3rd party sites for more information regarding this. Looks to have been a known issue for over a year+, reddit user has a clever work around 'tricking' the AI chatbot into redirecting you to the correct landing page for port forwarding (seriously?...).

>Attempt work around, mobile browser will not redirect from chat window to Xfinity app, great. (This is the link for those who want to try it to port forwarding: https://www.reddit.com/r/Comcast_Xfinity/comments/13810se/cant_port_forward_in_xfinity_app/)

>Call in to report the issue and ask to speak to a manager about being told to DMZ a device. Agent seems confused that the gateway GUI has the message redirecting to the app. Agent suggests I try the app as those are the only two things listed in their flowchart. Explain the situation to the agent and ask if it would be possible to escalate to report this issue. Seems worth reporting that a basic service like port forwarding on your services doesn't work and is known not to by the community. Agent says she will escalate my call, transfers me to a disconnected number.

I'd like to be able to configure the equipment I'm renting and use the service fully as I need to as well but it seems like Xfinity currently doesn't offer working port forwarding and agents will do anything to get out of having it escalated. So here I am wondering, how exactly I forward ports when all of the webservices to do so are broken and find it very unsettling there are techs out there advising customers to DMZ a device as a work around. Has anyone else had a similar experience trying to configure port forwarding with the hardware and support teams?