When the receiving authority returns a notarised document: the usual six reasons.
A rejected notarised document rarely means the underlying transaction failed. It usually means one of six recurring, avoidable formalities was missed.
Notarial
Powers of attorney for international use: the drafting points that matter.
A power of attorney valid in Nigeria can be rejected abroad for reasons that have nothing to do with the underlying authority it grants.
Apostille vs consular legalisation: getting the document accepted on first try.
Nigeria is not a party to the Apostille Convention — documents legalised the wrong way are routinely rejected by the receiving foreign authority.