Those figures gave victory to one opposition candidate, Felix Tshisekedi, but another opponent of the current administration insists he won.
Supporters of Martin Fayulu say Mr Tshisekedi made a power-sharing deal with outgoing President Joseph Kabila.
Mr Tshisekedi's team denies this.
The Constitutional Court is expected to rule within the next few days on a legal challenge to the result.
On Friday the country's government rejected the AU's call to postpone the announcement.
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