We don't recommend playing from two game accounts linked to one Google Play or Game Center account, as there is a possibility of losing progress, or getting a purchase on the wrong account.
 
If you've already had a free subscription which was paid from your Google Play or Game Center account, you can't get a free trial subscription again on another game account linked to the same Google Play or Game Center account of yours.

If you experience other problems with subscription, we recommend contacting Google Play or AppStore support for further assistance.