Hi @Nawaz ,
Welcome to Microsoft Q&A platform and thanks for using Azure services.
As I understand from the question, you are getting Error: 105077 ; the specified location string '[SYS].[ALL_USERS]' could not be parsed. A 2-part identifier was found. Exptected 3. when trying to connect Oracle and Azure Data Studio.
Could you please make sure that the location specified as a three-part identifier separated by dots. The first being the database (and domain), the second the user schema, and the third the table name.
This should help. Please share screenshot how you are using in ADS if unable to proceed.
Thanks in advance.