Can you play online with a game bought on a none online subscription account in switch

Ok, talking to EA Support has led the way. It is basically not a Fifa 18 specific feature, but a general feature of Nintendo switch.

It is about configuring Joy Con Pairing. There are different modes and one of them is "Solo horizontal grip".

To configure one Joy-Con out of a pair for this, you take the Joy Con and press the "SL" and "SR" buttons. These are on the side which connects the Joy Con to the switch console or the controller handheld. So of course "Solo horizontal grip" is only possible with Joy Con taken out of the Switch console or the controller handheld.

So the difference in pairing is that for dual joy con pairing you need to press "L" and "R" on the Joy Cons and for single joy con you need to press "SL" and "SR" on one of the Joy Cons.

Nintendo gives explanation here: http://en-americas-support.nintendo.com/app/answers/detail/a_id/22416

According to image from account transfer dialog and Nintendo support article, games purchased on one account are tied to it, and will be playable only on console, which has this account.

So

• She will be able to re-download games on her new Switch;
• All save data attached to her account will be transferred;
• Games will be indeed unplayable on current Switch*;

*It would be still possible to play on current Switch by using same account, which is possible if one console is primary and another is not, but there is the whole set of caveats in this case.