@Abhijit Sarkar - Thanks for the question and using MS Q&A platform.
Could you please confirm if you are using Azure CosmosDB for NoSQL or Azure CosmosDB for PostgreSQL cluster?
The endpoint for Azure CosmosDB for NoSQL should be as shown below:
The endpoint for Azure CosmosDB for PostgreSQL should be as shown below:
Note: In case, if you are using Azure CosmosDB for PostgreSQL, you need to use Azure Database for PostgreSQL linked service and not Azure CosmosDB for NoSQL.
For more details, refer to How to ingest data by using Azure Data Factory in Azure Cosmos DB for PostgreSQL.
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