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Please turn on JavaScript
This app needs JavaScript to run, and it’s switched off in your browser — or a “data saver” / “Lite” / “extreme” mode is blocking it. That’s why the screen is blank.
Open app.hoteldsk.com in Google Chrome, with JavaScript on: Chrome menu (⋮) → Settings → Site settings → JavaScript → Allowed. Also turn off any Data-saver / Lite mode.
Get Chrome from the Play Store