grammaticality - Conflicting who/whom usage rules in a sentence



Consider the sentence "Please gather information on who can serve as a proctor."


The he/him, she/her test gives conflicting answers here: One would say "Please gather information on her", but "He can serve as a proctor," and the entire sentence can't be accurately replaced with such a pronoun.


Which rule should be used? I know 'who' is acceptable regardless in colloquial English, but would it be valid to use 'whom' as well in this scenario?




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