Consul Node check is failing

Consul Node check is faling for 3/5 Instances with the following Error Message

HTTP GET http://169.254.169.254/computeMetadata/v1/project/attributes/ssh-keys: 403 Forbidden Output: Missing required header "Metadata-Flavor": "Google"

Not able to figure out why it is so consul is working fine for the rest 2/5 instances