A problem has occurred during connection: Unable to assume role 'arn:aws:iam:::role/'

Question

Hello
I've been trying to set up DataZone (BluePrint is Default Data Lake).
When I try to open data portal with IAM Role I received following message : A problem has occurred during connection: Unable to assume role 'arn:aws:iam:::role/'

I didn't find how to configure correctly ExecutionRole' policy.

Policies:
        - PolicyName: DataLakeAccessPolicy
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - kms:*
                Resource: !GetAtt KmsStack.Outputs.EncryptionKeyArn
              - Effect: Allow
                Action:
                - datazone:ListDomains
                - datazone:ListEnvironmentBlueprintConfigurations
                - datazone:PutEnvironmentBlueprintConfiguration
                - datazone:GetDomain
                - datazone:ListDomains
                - datazone:GetEnvironmentBlueprintConfiguration
                - datazone:ListEnvironmentBlueprints
                - datazone:GetEnvironmentBlueprint
                - datazone:ListAccountEnvironments
                - datazone:DeleteEnvironmentBlueprintConfiguration
                - datazone:GetIamPortalLoginUrl  # access to portal
                - ram:*
                - sso:*              
                Resource: '*'                
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AmazonDataZoneDomainExecutionRolePolicy
        - arn:aws:iam::aws:policy/AmazonDataZoneRedshiftGlueProvisioningPolicy
        - arn:aws:iam::aws:policy/AmazonAthenaFullAccess
        - arn:aws:iam::aws:policy/AmazonS3FullAccess

Thanks.

I check these posts: 
* https://repost.aws/questions/QULUsX9-VeTB-oO3OEfnlDNQ/unable-to-open-datazone-data-portal-through-associated-aws-account
* https://repost.aws/questions/QU-IG4sIN5QXy7greGK780Dg/datazone-portal-unable-to-sign-in-using-iam => in this one datazonecontrol is not available
* https://repost.aws/questions/QUR7hmD5TgQdWeORDISwyhZQ/datazone-cloudformation-region-enablement-error-in-env-blueprint-configuration

wesley_s · Accepted Answer

Hello, 
Thank you for sending your Question regarding Execution Role policy configuration for your Data Zone.
To assume a role, you need to follow the following steps:
1. **Create an IAM Role**: First, you need to create an IAM role that defines the permissions and trust relationship for the role. You can do this in the AWS Management Console, AWS CLI, or through AWS CloudFormation.
Refer to **[DataZone custom policy](https://docs.aws.amazon.com/datazone/latest/userguide/create-iam-roles.html#create-custom-to-manage-associated-account)**.
2. **Grant Trust Relationship**: When creating the role, you need to specify a trust relationship that defines which AWS accounts, services, or identities are allowed to assume the role.
3. **Define Permissions**: Attach one or more IAM policies to the role to grant the desired permissions. These policies define what actions and resources the role can access.
Kindly refer also to **[Assume IAM Role](https://repost.aws/knowledge-center/iam-assume-role-cli)** for more information.
For more clarifications on DataZone IAM Policies, please also go through **[DataZone IAM policies](https://docs.aws.amazon.com/datazone/latest/userguide/create-iam-roles.html)**.
I hope you find this information helpful. 
Good day!

A problem has occurred during connection: Unable to assume role 'arn:aws:iam::<account_id>:role/<my_role>'

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