This Roku page explains the Hotel/Dorm process: https://support.roku.com/article/215058118
One caveat: the Roku must already have been set up and linked to your Roku account. If this is a new, never-set-up unit (or one that has had its link wiped out by a factory reset) you'll need to set it up and link it via a conventional net connection before using the hotel/dorm login procedure - a cell phone hotspot can be used for this.
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