When configured the Grouper Provisioning Plugin will create a view in the Registry database that Grouper can query for subjects or users. The Registry database user needs the CREATE VIEW privilege in order to create the view. If you granted all privileges to the Registry database user then most likely the Registry database user already has the CREATE VIEW privilege. If you did not grant all privileges to the Registry database user, however, you can grant the privilege by doing
GRANT CREATE VIEW ON registry.* TO 'registry_user'@'localhost';
for MySQL/MariaDB or
GRANT CREATE VIEW ON registry TO registry_user;
for PosgreSQL.