I didn't know what "Easy Mobile SUICA" is so I did a little bit of reading with official JR East page https://www.jreast.co.jp/mobilesuica...bilesuica.html

Both Easy Mobile SUICA and regular Mobile SUICA are for mobile phones, but only Easy Mobile SUICA can recharge through the carriers, probably due to ties with the SIMs and carrier versions of the mobile phones so it is not transferrable and there is no way to re-issue the same card/number; on the other hand, Easy Mobile SUICA cannot use saved credit cards to recharge. It is mostly as an alternative for people who don't have credit cards.

Only JR East View credit cards can auto-charge Mobile SUICA it seems, with other credit cards one havs to do that manually whenever your mobile SUICA is low on balance.