Which version of 1Password did you buy? The version for OS X does not include iOS devices such as your iPhone, iPad, iPod, and Apple Watch. Agilebits does sell a 1Password bundle for $69.95 which includes OS X and Windows, however, versions for iOS and Android devices are different. By the way, the current version for OS X is 5.3.
Here is an explanation from Agilebits regarding licensing:
What licenses do I need to use 1Password on all my devices?
How is 1Password licensed?
1Password is licensed per user, per platform. At first glance that sounds complicated, but it’s actually quite simple once you get the hang of it.
The “per user” part means 1Password is licensed to you and not a specific computer or device. This means you do not need to purchase again when you buy another computer or device.
The “per platform” part means 1Password is licensed separately on OS X, Windows, iOS, and Android. This means that your 1Password for Mac license cannot be used to unlock 1Password for iOS.