Hyperdisk high availability on GKE

I have 2 nodes spread across 2 zones, where I run my deployments twice as a failover mechanism. In my nodes I have 3 pods that require access to a disk. All works well with a single node, but now 2 nodes must access the disk with read and write access, and I read this is possible with a high availability hyperdisk. I have been trying to do so by following this guide:

I changed the access mode from “ReadWriteOnce” to “ReadWriteMany”, as it says it’s supported. However, when I try to mount this disk, I get this message in the events:

failed to provision volume with StorageClass “balanced-ha-storage”: rpc error: code = InvalidArgument desc = VolumeCapabilities is invalid: specified multi writer with mount access type

I can’t figure out how to get this done, any help would be much appreciated!