Nulab Account is a single sign-on service that lets you sign in to all Nulab services including Backlog, Cacoo, and Typetalk, with a single account.
It also enables you to sign in to multiple Backlog Spaces with one account.
For more information on how to sign into Backlog with your Nulab Account, visit the Nulab Account Settings page.
For Backlog Classic Plan user, to sign in to Backlog with your Nulab Account, the Space administrator needs to "Permit Nulab Account login" on the Space Settings page.