Backup to S3 fails when AWS account does not own bucket (but still has read/write access)

I have created a secondary AWS account for the backup script to use. I have given this account write access the the backup buckets in S3.

Backup worked properly when I was using the access keys for the 'owner' account. But with the secondary account (which has read/write access), backup failes with the message:

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Failed to create S3 bucket : The requested bucket name is not available. The bucket namespace is shared by all users of the system. Please select a different name and try again.

Backup failed! See the progress output above for the reason why.
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It looks to me like Virtualmin is trying to create the bucket because a bucket of that name does not belong to the AWS account it is logging in as. This is a mistake because the bucket does exist and the account has read/write access to it. However, I have not looked at the source code (my Perl skills are a little rusty!)

I am running Virtualmin version '3.64 Pro'.

Best,

Adam

Status: 
Closed (fixed)