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Hello Chris,
Welcome to Microsoft Community and thank you for posting your query.
Let me assist you with Excel superscripts and subscripts key board shortcuts.
You may try the following key board shortcuts and check if it helps.
• For superscript, select the text or number that you want, and then press Ctrl, Shift, and the Plus sign (+) at the same time.
• For subscript, select the text or number that you want, and then press Ctrl and the Equal sign (=) at the same time.
You may also refer to the following link which discusses about the similar issue and check if it helps.
I hope the above information helps. Let us know if you need further assistance.
Thank you.