In this blog post, you’ll learn more about the SQL Server Error Code 1475 and the error message description that is shown
SQL Server Error Code
1475
SQL Server Error Description for the Code :1475
Database ?%.*ls? might contain bulk logged changes that have not been backed up. Take a log backup on the principal database or primary database. Then restore this backup either on the mirror database to enable database mirroring or on every secondary database to enable you to join it to the availability group.