I haven't seen "appoint" colocating with "to".Even Cambridge Advanced Learner's dictionary gives no such example:
1.( CHOOSE ) /əˈpɔɪnt/
[T] to choose someone officially for a job or responsibility
We've appointed three new teachers this year.
He's just been appointed (as) director of the publishing division.
[+ to infinitive] A commission has just been appointed to investigate fraud claims.
verb ( ARRANGE ) /əˈpɔɪnt/
[T usually passive] formal to arrange a date or time when a meeting or other event will happen
A date has been appointed for the election.
(Definition of appoint verb (ARRANGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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