Received unexpected email referencing a new sign-in

I'm a MSP, and I have quite a lot of my clients on 1Password on Mac, as well as myself.
I received the same sign-in alert yesterday, as did quite a few of my clients.
Something has obviously happened system-wide, either in Safari or in 1Password, that has triggered this alert.
I think the 1Password team should probably look into it, as if these things happen too frequently, people will just start ignoring alerts altogether.

Edit: it looks like the Safari extension had an update yesterday, which would coincide with the alert.
My clients get forced updates through Addigy, so this update might be the reason they all got the same alert at around the same time.