Please find out that she is making tea.
or
Please find out whether she is making tea.
Please let me know if these are correct.
#1 does not make sense. The first part asks about a possibility, but the second part treats the possibility as an actual fact. Only #2 is correct.
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#1 does not make sense. The first part asks about a possibility, but the second part treats the possibility as an actual fact.
Only #2 is correct.
Please find out does not take a declarative content clause (that ...).
It only takes an interrogative content clause (an indirect question):
Please find out ...
... who is making tea.
... what she is making.
... whether she is making tea.
... if she is making tea.
... when she will be making tea.
...