Currently a guest on an org's Teams account but i need to login separately with same email

Further to this, i get the "It looks as if this email is used with more than one account from Microsoft. Which one do you want to use?" The 'Personal' option then takes me to a screen which says "You're not on teams yet"?! And If i try and sign up again with the email it says "Looks like you're using a work or school account. Sign in to check if your organisation already has a Microsoft Teams licence waiting for you". But the point is i need a PERSONAL account for this same email address.