Longhorn Backup UI 504 timeout

I am getting 504 error while accessing Backup UI, Still I am not created any backup / snapshot. Please check the error log below

level=warning msg="backup store monitor: failed to list backup volumes in s3://BUCKETNAME@REGION/: 
error listing backup volumes: 
Timeout executing: /var/lib/longhorn/engine-binaries/pkgxxxxxxx-6000-lio-leng-v1.0.2/longhorn 
[backup ls --volume-only s3://BUCKETNAME@REGION/]

Can you check if you can use cli aws2 to fetch info/data from your backup target? BTW, a snapshot creation is required before a backup creation, but creating snapshots itself doesn’t require a backup target.