Brown’s financial trouble first came to light in February when HMRC filed a bankruptcy petition against him.
The High Court signed off the petition on April 12, with Brown since jetting out to Chile.
The former England international attended an event alongside his former United team-mate Diego Forlan.
He met fans in his role as United ambassador and signed football shirts and boots.
Brown has featured on United’s in-house TV and YouTube channels in recent times, while he is also an ambassador for Marriott hotels.
The ex-defender posed alongside Forlan for photos, whom he played with at Old Trafford between 2002-04.
Brown’s United career spanned 15 years – he rose through the club’s youth ranks and won the Premier League on five occasions.
He reportedly earned up to £50,000 a week during his career, which included spells at Sunderland and Blackburn.
Brown, 43, won 23 England caps between 1999-2010.
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Last year Brown split from his wife Leanne of Real Housewives of Cheshire fame.
The pair had been married for 20 years and now share custody of their three children.
Brown once had a property in Prestbury, Cheshire up for sale priced at £4.5million.