configuring log shipping in test environment.

I am trying to configure  the log shipping in test environment.

I am getting below error when the job runs.

Error: Backup failed for Server '***'. (Microsoft.SqlServer.SmoExtended) ***
Error: An exception occurred while executing a Transact-SQL statement or batch.(Microsoft.SqlServer.ConnectionInfo) ***
Error: Cannot open backup device '\\***\****\****.trn'. Operating system error 1326(The user name or password is incorrect.).
BACKUP LOG is terminating abnormally.(.Net SqlClient Data Provider) ***

Both the servers are in different domains. The secondary is on cloud VM .

I added the local account and tried to give the access to the shared folder.But it didn't work.

Can someone help me to fix this issue.Kindly let me know if i need to share any more information.