Migration Assistant not accepting administrator password on Mac

Im trying to migrate my data from my old Mac (2013) to a newer one . I get the link between the computers operating but then the Migration Assistant asks me for the System Administrator password. Im shown on the new Mac as Admin but my password is not accepted. Ive added another user (a variation on my name) and made myself another admin but still this is not accepted by Migration Assistant . Any help to resolve this would be appreciated.