The party chieftain said that the figure could rise beyond 41 million as the registration was still ongoing.
Heavy security presence was noticed at the Eagle Square and around the entrance to the venue.
Mr Ahmed said the APC had complied with all the rules and had appropriately notified INEC, adding that it is no longer an issue.
The ruling party postponed its national convention for the third time on Monday, spurning a large section of its caucus that wanted an urgent event.
Mr Dauda equally appealed to President Muhammadu Buhari to call the committee to order before it became too late.
The ruling party said the former chairman was also found guilty of bringing the image of APC to disrepute.
The group cautioned the party’s leadership to ensure that those defecting from opposition political parties abide by its progressive ideology.
The APC said Nigerians have consistently and resoundingly proven in two consecutive cycles of general elections as well as other off cycle elections, their outright rejection of the PDP.
