Dear Huon, User:Knisfo Is not giving accurate information on the Infobox official language of the African Union, as the AU has no 4 working languages, African Union has 6 official languages ​​and "any African language." Either are official languages ​​may be used as a working language. Here is a video from Youtube where it takes place in one of the Summit of the African Union, the announcement of the formalization of the Spanish in the organization. Wikipedia is not giving accurate information on this issue because a publisher called User:Knisfo  to change without any real source is allowed, just do not provide any evidence of his claim.

Equatorial Guinea President Teodoro Obiang, "Announces Spanish as Official Language of African Union"

The announcement happened during a press conference on 30 July 2011 immediately following the third day of the 17th Ordinary African Union Summit at the Sipopo International Conference Center on the island of Bata in the Republic of Equatorial Guinea. https://www.youtube.com/watch?v=hXYtVDz29wc — Preceding unsigned comment added by 80.103.69.206 (talk)