Bacpac Import fails with error 'The Element or Annotation class SqlDatabaseOptions does not contain the Property class CatalogCollation'
This has been fixed as part of build 14.0.17230.0 (not 14.0.17320.0) of SSMS.
Please update to the latest version.
You can read more about here:
https://blogs.msdn.microsoft.com/azuresqldbsupport/2018/02/15/what-will-happen-with-catalog_collation-and-case-sensitive-vs-case-insensitive/