RDS native backup to S3 does not change Lifecycle status (remains 0%)

Everything is set for the backup of RDS to S3. But when executed :

exec msdb.dbo.rds_backup_database @source_db_name='altahrirVersion', @s3_arn_to_backup_to= 'arn:aws:s3:::mumbaisqlserverbakup1/back1.bak', @overwrite_S3_backup_file=1;

the % complete remained as 0% till next day

Then I used:

exec msdb.[dbo].[rds_cancel_task] @task_id= 1

the task now shows: CANCEL_REQUESTED and 0%

Now i am stuck. I cannot create a new backup or cancel the standing one!

Please help me Thanks