Realm SYNC Host not found

Hi,
I get below error while using the example on mongodb Realm.

05-04 16:44:13.056 5525-5551/m.realmjava E/REALM_SYNC: Connection[1]: Failed to resolve ‘ws.ap-south-1.aws.realm.mongodb.com:443’: Host not found (authoritative)

As per mongodb webstie mongodbp atlas is supported on ap-south-1

A similar error for another AWS site got resolved as per another discussion in this forum by updated settings by MongoDB team. Does this error also needs similar fix?
-sandeep