Ah, I'm pretty sure the speed test is performed by the router, with it in bridge mode it may not be able to run it.When I first setup Starlink I left the Starlink router and AP on, but didn't use either and fed the WAN port on my Ubiquiti DM-Pro and onward from there to many APs etc. I had my Ubiquiti SSID broadcasting, as well as the Starlink SSID. It all worked fine, although theoretically there was a potential problem with running an additional router (Starlink) upstream of the main one. With the Starlink app I could connect to the Starlink SSID and have full functionality of the Starlink App to run direct Starlink speed tests and some other things I'm forgetting.
When I upgraded to the Business dish with a new Starlink router/AP box, I disabled the router/AP part because of the theoretical problem of having two routers. I used to do this with other ISPs: disable the router part of the cable/fiber modem because I used my own router. I could still 192.168.what.ever into the modem.
Starlink now serves the WAN port on my Ubiquiti DM-Pro just fine, but now the Starlink app on my phone can't connect "direct" to the Dishy and Starlink Router box -- it has to go through my local network. So it won't give me the Starlink Speed test It says "Connect directly to your Starlink network to run a Starlink speed test." But since I disconnected the STarlink router, that also turns off the STarlink SSID so there is no way to connect "directly" to the Starlink router. It still gives Statistics and Obstructions map, but the "network."
And the 192.168.100.1 is a good idea but it doesn't work -- just dead no response and doesn't get me into the Starlink Modem/dormant router.
By the way, I recommend Ubiquiti stuff as it gives you good cool info like below, as well as the main thing: feeding a bunch of coordinated APs over a large house, and now load balancing if you have an additional ISP.
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100.1 was for residential Dishy, but it sounds like you can get to it through the app?