Hi @lauwiks,
To be clear, 1Password supports User Provisioning via Azure Active Directory, but we do not support SSO as a login method to 1Password. This is due to the who and what gets to hold the encryption keys to your 1Password account. I'd be happy to expand if you are interested in the technical details. If you are really interested in detail, you can also take a look at our '1Password Security Design' whitepaper here: https://1password.com/files/1Password-White-Paper.pdf
At the end of the day, 1Password works very well in concert with an SSO provider. You can find a more detailed explanation here: https://blog.1password.com/1password-and-sso-a-perfect-match/
Let me know what further questions you have.
Graham