Question Regarding Region Connection (Singapore) While Playing VSA in FC Mobile

As far as I am aware, use of a VPN is not against the terms of service, although it is generally not recommended for PvP play as it ads an extra layer of distance to the connection, thus potentially increasing your lag to the EA server.

if you are getting warnings, then maybe contact the Terms of Service team via EA Help website - this pinned thread should point you in the right direction 

https://forums.ea.com/blog/ea-sports-fc-mobile-game-info-hub-en/fcm-how-to-appeal-a-ban-or-suspension/12998802