Password for NAS

I’ve currently got an issue where I’m trying to schedule a backup from our NAS to an S3 server we can get the backup to work from files from the desktop but when I connect it to the NAS it gives me an error messaging saying failed to decrypt data invalid passphrase or Invalid password or corrupt data.

My guess is that the issue is with an invalid passphrase as I’ve never entered one anywhere for the NAS and can’t see where to do this?

The NAS is mapped to my PC as a Network Drive and the NAS has FTP and SFTP enabled

Any help would be appreciated.