I should have referenced no. 99 from the Ecumenical Directory (I am scheduled for cataract surgery and hope to be excused for the error). I will paste.
Particularly, "99 a) There is no doubt about the validity of baptism as conferred in the various Eastern Churches. It is enough to establish the fact of the baptism. In these Churches the sacrament of confirmation (chrismation) is properly administered by the priest at the same time as baptism. There it often happens that no mention is made of confirmation in the canonical testimony of baptism. This does not give grounds for doubting that this sacrament was also conferred.
b) With regard to Christians from other Churches and ecclesial Communities, before considering the validity of baptism of an individual Christian, one should determine whether an agreement on baptism (as mentioned above, n. 94) has been made by the Churches and ecclesial Communities of the regions or localities involved and whether baptism has in fact been administered according to this agreement. It should be noted, however, that the absence of a formal agreement about baptism should not automatically lead to doubt about the validity of baptism.
c) With regard to these Christians, where an official ecclesiastical attestation has been given, there is no reason for doubting the validity of the baptism conferred in their Churches and ecclesial Communities unless, in a particular case, an examination clearly shows that a serious reason exists for having a doubt about one of the following: the matter and form and words used in the conferral of baptism, the intention of an adult baptized or the minister of the baptism. 111
d) If, even after careful investigation, a serious doubt persists about the proper administration of the baptism and it is judged necessary to baptize conditionally, the Catholic minister should show proper regard for the doctrine that baptism may be conferred only once by explaining to the person involved, both why in this case he is baptizing conditionally and what is the significance of the rite of conditional baptism. Furthermore, the rite of conditional baptism is to be carried out in private and not in public. 112"