--snapshot-location-config doesn't have arg for region

--snapshot-location-config doesn't create the storage, you must do so yourself. You can specify a different region, a different Azure subscription, or even a different provider, like AWS.

For Azure, follow the instructions here to create your storage container.

If your provider supports a region config (Azure does not - see Volume Snapshot Location Config doc and Backup Storage Location Config doc), it is configurable using the --config, e.g. --config region=us-west-2. Check your provider plugin to see whether different regions are supported, what the key name is, and what possible values are supported.

Refer to the Velero locations documentation for examples of using multiple snapshot and backup locations.

Update:

Although velero snapshot-location create allows you to specify a --provider, the Limitations/Caveats section of the Location documentation specifically states that only a single set of credentials is supported, and furthermore that Azure specifically does not allow creation of snapshots in a different region:

Velero only supports a single set of credentials for VolumeSnapshotLocations. Velero will always use the credentials provided at install time (stored in the cloud-credentials secret) for volume snapshots.

Volume snapshots are still limited by where your provider allows you to create snapshots. For example, AWS and Azure do not allow you to create a volume snapshot in a different region than where the volume is. If you try to take a Velero backup using a volume snapshot location with a different region than where your cluster’s volumes are, the backup will fail.

I personally find this confusing -- how could one use a different provider without specifying credentials? Regardless, it seems as if storage of a snapshots in a different region in Azure is not possible.