If you have not used OLT in recent years (since 2019), you will need to create a new account.
OLT has created the OLT ONE account, you can use the same sign in for multiple tax years and have all of your information in one account.
Once you create your new account, you can link any prior years, back to 2019) to this new account.
Going forward this will be a continuous use account where all past and current returns can be accessed.