There actually are no ISC2 centres, they are all from Pearson VUE. In fact Pearson VUE will be franchising out so these centres are probably affiliates/partners.
It looks like the more planning needed to be conducted when offering CC globally as the economic realities of travel are huge in developing nations, and Nigeria has a population of 230 Million - bound to be some aspirational folk there following the marketing. I’m less worried about established people in the industry traveling(after all they have better financial resources), but they should be considered as well.
@yamontijo this should probably have more than a private message, but needs a sticky FAQ in the community and if test centre access is a big problem for substantial numbers of people in a country then it should be called out well in advance of the sign-up as people can then plan before synching the time, money(in this case for other certs and CC retakes) and effort.
Best searchable thing I can find from Pearson VUEs site is this below, there might be a better place but it should go up with a big old linked Test Centre FAQ front and centre in the exam marketing.
https://home.pearsonvue.com/Clients/HPE/africa_voucher_steps-11-9-15.aspx