If you are speaking with someone at a hotel's reception desk, then you would be understood.
But in other contexts, you may not. Sometimes, sales people have early morning calls they make on clients to maximize the time they can spend with each.
Thank you very much, JohnParis,
But I'd like to ask one more question. Do native speakers of English call the reception desk and say "I need a morning call for six o'clock tomorrow morning?" Thank you again.
No. They ask for a wake-up call in AmE. In BrE, I believe, they ask for an alarm call.
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