i sent an email to plarium, that's the answer to the same question in the tread:
Dear Jarl,
Thank you for the reply.
Unfortunately, it is not possible to link plarium.com accounts to the services such as Facebook or Google Play.
Therefore, your existing account in plarium.com (on PC) cannot be restored on any mobile devices.
Just for your reference, we also have Facebook version.
https://apps.facebook.com/vikingsmobile/
If you play the Facebook version ( https://apps.facebook.com/vikingsmobile/
) on your PC, then it is possible to restore the game data on any phone device.
http://support-portal.plarium.com/en/vikings/faq/account-linking/restoring
Please do not hesitate to ask us if you have further question.
Best regards,
Your Plarium Support Team
I started a while ago playing on the PC and thinking that I could also play on the mobile when I saw that there was an application on ios and android.
No warning when I start playing or at register ... really? In the era of mobile devices?
But none of that, do different platforms make it impossible to synchronize? ok I can understand that it is complicated. But and transfer an account from one system to another, and not to lose the money spent? ??
This means that at the moment I do not spend more money until I know if in the future I will be able to switch to mobile gaming.