HTTPError 400: Invalid value for field 'resource.ipv6AccessConfigs

I would like to update the IPv6 address of my instance from the gcloud cli. I am using this command:

gcloud compute instances network-interfaces update i-20260502 --external-ipv6-address 2600:1900:4021:7183:0:29:0:0 --ipv6-network-tier PREMIUM --zone us-east1-b --stack-type IPV4_IPV6

However it returns with this error:

ERROR: (gcloud.compute.instances.network-interfaces.update) HTTPError 400: Invalid value for field ‘resource.ipv6AccessConfigs’: ‘’. Updating this field is not supported.

Why would this report that updating the field is not supported? Is that not the purpose of the command?

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