We had similar issues in a dorm room. After contacting IT for the college, it turns out we needed to register the Roku's MAC address with the WiFi provider. We had to do this for all devices that don't have an internet browser, such as a Nintendo Switch. Call the WiFi provider's help line and they should be able to help. The MAC address is under the settings for the network on the Roku device. Call the college IT department, they should be able to help.