Terraform cannot read from remote state - amazon-s3

Question

Terraform version
v0.12.1
AWS provider version
v2.16.0
I've Terraform workspace configured, as for now my workspace is pointing to dev where I've a tfstate file for my VPCs and Subnets and a different one for my security groups, however when I'm trying to refer vpc_id from my vpc remote tfstate into my security group then I get below error message
No stored state was found for the given workspace in the given backend.
My s3 bucket looks like below
nonprod-us-east-1
|-- env
|-- dev
|-- vpc_subnet/tfstate
|-- security_group/tfstate
Terraform Configuration Files
Security-Group tf config
terraform {
backend "s3"{
# Configuration will be injected by environment variables.
}
}
provider "aws" {
region = "${var.region}"
}
data "terraform_remote_state" "vpc_subnet" {
backend = "s3"
config = {
bucket = "nonprod-us-east-1"
key = "vpc_subnet/tfstate"
region = "us-east-1"
}
}
vpc_id = "${data.terraform_remote_state.vpc_subnet.outputs.vpc_id}"
And I've verified that my vpc_subnet/tfstate oputputs has vpc_id
Outputs from VPC subnet tf state
outputs": {
"private_subnet_cidr_blocks": {
"value": [
"10.0.3.0/24",
"10.0.4.0/24",
"10.0.5.0/24"
],
"type": [
"tuple",
[
"string",
"string",
"string"
]
]
},
"private_subnet_ids": {
"value": [
"subnet-042a16dd291e90add",
"subnet-02e8322d996968a3f",
"subnet-078f525c24015b364"
],
"type": [
"tuple",
[
"string",
"string",
"string"
]
]
},
"public_subnet_cidr_blocks": {
"value": [
"10.0.0.0/24",
"10.0.1.0/24",
"10.0.2.0/24"
],
"type": [
"tuple",
[
"string",
"string",
"string"
]
]
},
"public_subnet_ids": {
"value": [
"subnet-0ba92a28f6e8ddd95",
"subnet-08efcb80bed22f4e2",
"subnet-0b641797bfe207a0b"
],
"type": [
"tuple",
[
"string",
"string",
"string"
]
]
},
"vpc_id": {
"value": "vpc-0bb7595ff05fed581",
"type": "string"
}
}
Expected Behavior
It should be able to read vpc_id from remote tf state location.
Actual Behavior
Failing to read output from remote tf state

Answer 1

Finally sorted it out, it comes out to be an issue with bucket key, since I'm using Terraform workspace so the tfstate files are created under folder env:/dev/vpc_subnet/tfstate, after correcting bucket key, it's able to resolve the tfstate files.