Plural marriage and fair treatment of co-wives, Dought & clear, - * Does he have to tell his second wife that he is married?

I married a foreign woman after she became Muslim in a shar'i marriage
in accordance with the laws of Allah and the Sunnah of His Messenger,
and I concealed from her the fact that I was married before. Is my
marriage legitimate or do I have to tell her that I am married and
that she is the second wife? Please note that I concealed this matter
from her because the country in which we live does not allow plural
marriage.
Praise be to Allaah.
It is not obligatory for the husband to tell the second wife that he
is already married and this does not affect the validity of his
marriage to her. So long as the marriage contract fulfilled the
necessary requirements and conditions, then it is valid.
Shaykh Ibn Jibreen (may Allah preserve him) was asked: Is it essential
for the marriage to be valid that a man should inform the woman he
wants to marry that he is married to another one, if he is not asked
about that? Are there any consequences if he denies it if he is asked?
He replied: The man is not obliged to tell the woman or her family
that he is married if they do not ask him, but that cannot usually be
hidden because marriage is not usually done except after a period of
enquiring and asking about each of the two partners and verifying that
they are suitable. But it is not permissible to conceal any facts, and
if either party tells a lie and the other party acts on the basis of
it, then there is the option of cancelling it. If he says that he is
not married and is lying about that, then the woman has the option of
annulling the marriage. If they say that she was a virgin when she is
not, then he has the option of going ahead with the marriage or
cancelling it.