Cannot get access to admin login screen on my SRR60/AC3000 router

Hi

I have a new device I need to connect to the network that requires my phone to be connected to a 2.4GHz wifi. As my phone will not allow me to select the frequency, I need to make a change to the router settings. When I tried to access the router using the IP address, it errors (Hmmm… can't reach this page. It looks like the webpage at https://192.168.0.nnn/ might be having issues or it may have moved permanently to a new web address.)

• Accessing the router through a browser using the ip address used to work.
• Hardware is Orbi SRR60/SRS60 and they are all at the latest firmware.…
• The wifi network is working fine.
• I’ve checked the IP address of the SRR60.
• I’ve tried both Edge & Chrome on the Win11 PC & also tried browsers on my phone. I’ve tried another PC as well as clearing browsing history.
• I can access the router on the Orbi App, but this doesn’t give me the ability to modify the settings needed.
• I’ve tried resetting the Routers, but no luck.
• I’ve tried using Insight Cloud, but again there is no option to edit advanced wifi setting.

I seem to be going around in every frustrating circles, any suggestions?