"You’ve used a newer version of 1Password on this device"

@chris55

Your issue sounds like one we resolved several updates ago. Well, it's vaguely like that one. You mentioned 1Password 8. I wasn't sure if you were using the beta and then tried to switch to production which would cause this message due to a mismatch in the database type. To resolve it you would reset the database and allow it to be recreated. Assuming that you attempted to got from beta to stable. It could also be related to whatever the trouble is here.

Please reset the database and then let us know if the trouble continues. The steps can be found here. https://1password.community/discussion/129049/warning-popup-on-launch

• It's imperative to the safety of your data that you ensure it is available on https://my.1password.com and ensure you have a copy of your 🚒 Emergency Kit and that you know your password before you begin.

Double-check that all data is present on 1Password.com. If you've been offline and you've made changes you could lose data if it is not on 1Password.com. This would include updates to items you've made.