Hey there! Nice to meet you!
If I may ask, may I know the exact error messages/codes upon attempting to sign in to your email account?
Have you forgotten your account's password by any chance?
Do you see any unfamiliar email address/phone number upon signing in to your account?
Did you have two-factor authentication (2FA) active on the account? If you do have the 2FA active, are you able to access the second factor of authentication?
In the meantime, please try to follow the Sign-in helper tool in case this would work through this link:
You can also follow this troubleshooter guide for your missing SMS verification codes:
Best regards,
Darhyl