I found a solution to my problem and I am posting it here.
In order to do a Data Preview of Attribute views, you need to run the SQL (Call "HCP"."HCP_GRANT_SELECT_ON_ACTIVATED_OBJECTS") AFTER deleting all tables in your Dev schema. I was running it with tables still in my DEV schema, and hence it was throwing this error. The second part is that I need to recreate these tables in my NEO schema, and not the DEV schema.
After deleting my tables, I ran the SQL, and then recreated my tables in the NEO schema. Then I recreated my attribute view, and activated it. The _SYS_BIC schema started to show. And I could do a Data Preview of my Attribute Views.
Hope this helps anyone who faces the same issue.