Always go to an experienced avian vet for parrot microchipping
African Grey parrots (AGP) were elevated to CITES appendix 1 on 4th Feb 2017. An A10 certificate is required if owners want to use the bird for commercial purposes (which include selling it or its offspring for money).
If the bird was bred pre 4th Feb 2017, the owner can get an A10 with various means of "proof" that it was hatched before that date, providing the bird is uniquely identified. Various documents can be used to support ownership prior to 4th Feb 2017 to enable the A10 to be issued, such as dated sexing certificates, microchipping, veterinary attendance, pet insurance etc.