Device settings issue

I had this happen yesterday.  All devices show offline, however each was still connected to the internet but were no longer able to connect to each other. This was a problem only for the TV and DVR of course.  The FIX??  I started to create a new network on the router to join JUST the TV and DVR into to see if they would actually be able to see each other.  The result - JUST creating a new config and saving it - before even moving either device over to the new network - all the devices were ONLINE and could again talk to each other.  Rebooting DIDN'T do it - but creating a new network must have refreshed some setting or table?  The result it that everything talks again.  This is the taller round router with the digital display on the top vs the smaller one with the display on the side - I don't know if that matters.  hope this helps someone.

I went to a linux laptop, which like Roku, has worked fine from day 1 with t-mobile home internet. Just like Roku, it stopped working today. Like Roku, it does not list the t-mobile router in configuration. Like Roku, the t-mobile app reports "Offline" and has 4 bars.  What crap.

As bad as Comcast is, at least it works. The t-mobile home internet was a complete waste of time and money. What crap.

The t-mobile app is completely useless. It provides NO functionality. What crap.

There is no known way to access the configuration settings, according to tech support. What crap.

t-mobile tech support has no clue how this works or how to fix anything. What crap.

My landline, Windows PC, and my network extender for my solar panels never worked. What crap.

Roku just stopped working.  T-mobile app says 5 bars, but it's listed as "Offline". It has been working for a couple of months. Today it just stopped working. What crap.

Thanks. I think we agree that this app is almost useless...

OK so the Nokia 5G21 gateway. I am running firmware version 1.2201.00.0324 and it reports "20" devices online but I have W10 laptops, MacBooks, iPads, phones, Xbox, PS3, WiiU, Switch, and 5 Linux clients, Harmony hub and AV receiver that all appear at one time or another but no cameras or garage door hub etc… so the web GUI reports 20 devices but it only states that. It will not list them. When I run a scan I can see the currently active 12 clients.  The T-Mobile HI mobile application will list the devices when it works but well that is when it feels like working which is seldom and the listing is not super informative. I do all the gateway management with the browser or my iPad Pro but gave up on the mobile application. I use a IP scanner or Zenmap on my MacBook Pro to scan the LAN for active IP addresses and both works great. If you want to find the active hosts on the local network, IP Scanner is easy and fast. Zenmap can be more verbose and will list the open ports etc… handy to see what is going on. The web GUI interface seems to keep track of the number of clients but does not solo limit the count to what is active. So, the device reporting is a bit sketchy.