timothypcook
Since you were able to connect to your office router, go to Settings/Networks/About and see what wireless channel you are currently using. Also make a note of your IP Address, Gateway, and the Wireless MAC address.
Other than the Wireless MAC address, you can feel free to post here what the channel number, IP address and Gateway are. (this will let us know what band you are connected to as well as the LAN IP addresses that are now stored in the Roku device).
Additionally, try connecting to a mobile hotspot again now that you have had success connecting to an alternative network. (try connecting while you are still at this work location). Kind of trying to determine if your mobile hotspot may not be working.
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To address your responses.
With this router, the only way to configure each band's mode independently is to disable "Smart Connect" under the Wireless Settings. When Smart Connect is enabled, both the 2.4ghz and 5ghz will use the same settings (where appropriate). It is a typical mesh-router feature.
If you disable Smart Connect, you should now see the ability to change the 5ghz Mode to exclude AX (wifi6) and be(wifi7). You don't really need to exclude AX, we just need the ability to include AC (wifi5).
However, let's hold off on changing those settings for now. Instead, try creating a Guest Network. Do one for the 2.4ghz band and see if Roku connects. Then create one for the 5ghz and see if Roku connects. When you are setting the password type, select "Encrypted" or "No Security" (just for troubleshooting), and not "Portal". Also, make sure to uncheck "Hide SSID" (appears enabled by default).
I would start with No Security first, and then try with Encrypted. (trying to determine here where the culprit is).
Make sure to restart both the router and the Roku device after creating the Guest Network(s).
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Feel free to report back with the above information and your progress. Once you can get the Roku to connect, we can fine-tune the regular network settings if you prefer.
