I had the same problem and found how to fix it.

Mozilla Firefow update on my computer and their last version disabled TLS.

You will have this information "Failed to load resources : https://live.plarium.com/vikings/versions/4.7.0/webgl/main.json"

If yes, you can go click on this link, and after that you can click to activate TLS, it will solve your problem.

I had the same problem and found how to fix it.

Mozilla Firefow update on my computer and their last version disabled TLS.

You will have this information "Failed to load resources : https://live.plarium.com/vikings/versions/4.7.0/webgl/main.json"

If yes, you can go click on this link, and after that you can click to activate TLS, it will solve your problem.

Dear Jarls,

We are sorry for any inconvenience caused. We are already aware of the issue and are working to resolve it. We assure you that our technicians are doing their best to restore the game. Right now you can also use another browser or Plarium Play app.

We hope for your understanding.

modify :

security.tls.version.enable-deprecated

in the config of firefox

Greetings!

We are aware of this issue and currently working on it. Thank you for understanding and patience.