Gauff, who will face Spanish 11th seed Paula Badosa in the quarter-finals, has more than 750,000 followers on TikTok.
Because she was in Melbourne, she wondered if the ban would still apply.
“I honestly thought I’d be able to get away with it,” added Gauff.
“I guess it’s something to do with my number. I don’t know. I have to do some research.”
US President-elect Donald Trump had said he would “most likely” give TikTok a 90-day reprieve from the ban after taking office on Monday.
Defending champion and top seed Aryna Sabalenka, who has more than 500,000 followers on the platform, is also hoping the ban is lifted.
The Belarusian, who beat Russia’s Mirra Andreeva to reach the last eight, recreated one of her viral dance videos with fans on Rod Laver Arena after her first-round victory a week ago.
“This isn’t something we can control and I hope they’re going to figure it out because I love TikTok,” she said.
Sabalenka is set to face another Russian in Anastasia Pavlyuchenkova in the quarter-finals after the 27th seed beat Croatia’s 18th seed Donna Vekic.
