Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Laura L,
Thank you for coming to the forum. There is a chance of some sort of malicious activity.
Please change your password and enable two-factor authentication if you do not have it enabled already.
Steps on how to enable 2FA: https://support.office.com/article/c7910146-672f-01e9-50a0-93b4585e7eb4