Hi there, Poppi! This is Marc. Thanks for reaching out to the community.
If you can’t remember your password, the first step is to try resetting it here: https://account.live.com/password/reset. If that doesn’t work because the system can’t confirm your info, the next option is to use the Account Recovery Form: https://account.live.com/acsr. This is the only way to prove ownership without access to your recovery phone or email.
For more tips and troubleshooting, you can check Microsoft’s Sign-in Helper: https://support.microsoft.com/en-us/account-billing/i-can-t-sign-in-to-my-microsoft-account-475c9b5c-8c25-49f1-9c2d-c64b7072e735.
Let me know how it goes.
Best regards,