“accredited" = "ACCREDIT -> To supply with credentials or authority; authorize": credenciado, autorizado, certificado, registrado (contador, por ex.)
to bring into credit or favor
to authorize; give credentials to an accredited representative
to believe in; take as true
to certify as meeting certain set standards colleges may be accredited by regional associations
to attribute; credit an action accredited to him
The use of the participle "credentialed" to refer to certified teachers and other professionals is well established (She became credentialed through a graduate program at a local college), but its more general use to mean "possessing professional or expert credentials" is still widely considered jargon.
Source: Your Dictionar and other