Hiii when I try to send a stable ebs I get an: Oops! Stables must be actively played in order to send ebs. error. How this be fixed?

Exactly what it says: you have to get horses, riders, show them and play actively - no one knows how it is determined, by the way.

And as a hint: this was implemented to prevent stables to create new accounts and send the ebs to another account. Especially not to the side accounts ;)

My side accounts were capable of sending EBs to others once I had five horses on them.

It works with the 5 horses, thank you:)