Question:

Is it possible to change vault user security policy in bulk, such as change basic to SSO?

Answer:

Yes, it is possible.  Use the Vault Loader.

Please be sure the new Security Policy is defined and it points to a valid SSO Profile.

1. Set the user Security Policy field to a new value in the CSV.

2. Update user's federated ID.

3. Import the CSV file and update the User's Security Policy information with Vault Loader.

Related Documentation:

Vault Help Documentation: Vault Loader

Thank you