iacisrmma, for matzos mitzva nobody allows egg matza. The question is only for the rest of Pesach. Sefardim allow it for everyone, Ashkenazim only allow it for those who are unable to eat normal matzah (veyesh lomar that now that we have potatoes perhaps even they should not be allowed).
YabiaOmer, there is a teshuva in Yechaveh Daas (I don’t remember which volume but I’m sure you can find it in the index) about whether a Sefardi shopkeeper who carries matza ashira on chol hamoed may sell it to a customer he knows to be Ashkenazi. He paskens that the shopkeeper must put up a sign informing customers that this is forbidden to healthy adult Ashkenazim, and then if an Ashkenazi brings it to the counter he may assume that he must be buying it for those who are permitted to eat it.