Creating backingstore for Hitachi HCP gives "Target bucket doesn't exist"

When trying to create a backingstore for a Hitachi HCP bucket with:

noobaa -n noobaa backingstore create s3-compatible k8s-labb-timescape-labb --endpoint https://timescape-labb.k8s-labb.hcp.mydomain.com --signature-version v4 --access-key dGl***********hYmI= --secret-key 644e3*****************ade3e4 --target-bucket timescape-labb

I get the following error:

time="2024-04-10T09:32:50Z" level=error msg="⚠️  RPC: pool.create_cloud_pool() Response Error: Code=INVALID_TARGET Message=Target bucket doesn't exist"
time="2024-04-10T09:32:50Z" level=info msg="SetPhase: temporary error during phase \"Creating\"" backingstore=noobaa/k8s-labb-timescape-labb
time="2024-04-10T09:32:50Z" level=warning msg="⏳ Temporary Error: Target bucket doesn't exist" backingstore=noobaa/k8s-labb-timescape-labb

I have no trouble accessing the bucket with any S3-client using a virtual host style connection.
Hitachi HCP also uses a certificate from a internal CA which has been added to the ca-bundle, e.g a curl towards the endpoint from the noobaa-operator pod works fine.

$ noobaa version
INFO[0000] CLI version: 5.15.1
INFO[0000] noobaa-image: noobaa/noobaa-core:master-20230920
INFO[0000] operator-image: noobaa/noobaa-operator:5.15.1

noobaa / noobaa-operator

Creating backingstore for Hitachi HCP gives "Target bucket doesn't exist" #1339