@hernan1
When you say you "purchased access to an Xfinity hotspot", are you trying to connect to as hotspot owned/provided by the apartment complex?
A couple of years ago, Xfinity disabled the 2.4ghz bands of public/commercial hotspots by default. The "owner" of the public hotspot had to request from Xfinity that it be enabled. It could be that your apartment complex is using this configuration. You could talk to apartment complex, or call Xfinity and give them the hotspot address and they should be able to confirm if this is the issue.
From your Roku device, go to Settings/System/About. If you see any other model other than Roku Express 3960, then your device is 2.4ghz-only capable. The Roku Express 3960 is dual band (2.4ghz and 5ghz capable).
Easiest remedy may be to just purchase a 5ghz capable Roku device (Roku Express 3960 or Roku Express 4k+ 3941) that is capable of 5ghz connection. (All the newer devices listed at https://www.roku.com/products/players are now dual-band.)
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Other avenues to explore is to use an "ad-hoc" network. You can use a laptop to connect to the Xfinity hotspot, and then connect the Roku to the laptop's network signal. (basically, the laptop will broadcast a hotspot signal that the Roku, and other devices can share and connect to.)
I have also tested out some Verizon and T-Mobile 5G Gateways/Home Internet (basically mobile hotspot devices) and their plans are pretty reasonable so maybe can purchase one and have your own hotspot (rather than paying to share a connection with others). The other benefit of an owned device is the ability to do some configuration on your own. Essentially, the above 5G hotspots are plug-and-play (very easy to setup).
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102
