"New 1Password sign-in from Safari" email received but no access had occurred - what to do? breach??

One of my family users received an email from 1password yesterday with the subject line "New 1Password sign-in from Safari", however that family member had not used 1Password at all during the time period.

I have temporarily suspended the account but am concerned that there may have been a breach. Is there a way to tell? And what should my steps be now???

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