You don’t type the word “phase”. You type water directly.
One way to find out the command is to type it in the console. You can hit Enter and you’ll get the list of available options. You can type one of the options and hit again and Fluent will show you a sub-list of options.
You can then put them together. In the above example, the TUI command will be /solve/patch water fluid () mp 0.1
Similarly, you can find out for your case and put this command in Execute Commands.
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