Generic storage backup with free license

Hi,

I have an instance of Kasten K10 on the free license, and need to use Generic Volume backup.
I have already requested and received a Generic Volume Backup key from support and updated my helm installation to include the key.

I have also configured Kanister sidecar injection, and the sidecar containers are injected correctly.
However, if I try to run a backup of the application used for testing, I run into this error message:

{
	"message":"Failed to backup data to Kopia API server",
	"function":"kasten.io/k10/kio/kanister/function.(*backupDataToServerFunc).Exec",
	"linenumber":155,
	"file":"kasten.io/k10/kio/kanister/function/backup_data_to_server.go:155",
	"cause": {
		"message":"Failed to establish connection to Kopia API server",
		"function":"kasten.io/k10/kio/kanister/function.backupDataToServer",
		"linenumber":218,
		"file":"kasten.io/k10/kio/kanister/function/backup_data_to_server.go:218",
		"cause": {
			"message":"Failed while waiting for Kopia API server to start",
			"function":"kasten.io/k10/kio/kopiaapiserver.WaitTillCommandSucceeds",
			"linenumber":56,
			"file":"kasten.io/k10/kio/kopiaapiserver/wait.go:56",
			"cause": {
				"message":"Failed to exec command in pod: command terminated with exit code 126.\nstdout: OCI runtime exec failed: exec failed: unable to start container process: exec /usr/local/bin/kopia: operation not permitted: unknown\nstderr: "
			}
		}
	}
}

I couldn’t find anything on this or a similar error message anywhere online.
Has anyone experienced this before and can point me in a direction on what to look for?

Thank you all very much!

Kind regards,
Felix