Additional sign-in or account-related issues within Microsoft Teams Free
Hi Norielyn, sorry to hear about your locked account. You can try unlocking it by visiting https://account.live.com/acsr and following the recovery steps.
If that doesn’t work, contact Microsoft Support directly https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 for faster assistance.
Hope this helps, let me know.
Chard