MySQL Error: Table ‘pwbe_variations’ doesn’t exist

This is an “Access denied” error. This occurs if the logged in database user does not have permission to create temporary tables in the WordPress database.

The bulk editor relies on temporary tables to handle some of the processing. You will need to contact your hosting provider to allow your WordPress database user to create temporary tables.

The privilege they need to grant you is:

CREATE TEMPORARY TABLES

See here for details: https://dev.mysql.com/doc/refman/5.7/en/privileges-provided.html