When the tank becomes full or empty it will close the adjacent pipe, as in your case pipe P-22 is closed because of which all the demands on junctions in the model are disconnected as no water is supplied, tank being closed.
Please graph the tank levels and check why it becomes empty or full, you need to have controls in the model to operate the tank so as it neither becomes empty nor full. See below article for more details.
What happens when a tank becomes empty or full? (altitude valve)
Also flow demanded in the calculation summary is zero, which implies that there are no demands in the modal, demands can be entered through demand control center.
Unit demand control center Vs. Demand control center
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