I notice that with the last beta version of 1Password the OTP code is not copied anymore into clipboard as it was the case since several versions. I hope it is just a bug and the feature will be back into a next version.
1Password Version: 1Password 6 Version 6.5.1 (651005) AgileBits Store
Extension Version: 4.6.1
OS Version: OS X 10.12.1
Sync Type: 1Password.com