Max connected devices on a Key Premium subscription

I have multiple devices connected to a Key Premium subscription, but i seem to be having some sync troubles, as the machine i consider as my main machine doesn't seem to sync new passwords to other clients.

 

Connected to they Key Premium i have

3 PC's

2 Android devices

2 iOS devices

 

Is there a limit on connected machines per Key Premium subscription? Is there a way on how it would be wise to start debuggin sync problems?

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