After you create an IAM user, you can attach a policy to it (in order to give the user permissions). For the sake of development, I suggest that you attach the managed policy called "AdministratorAccess".
As a recommendation, I suggest that you give "least-privileged" permissions to IAM users in your production workloads.
After you create the IAM user and attach the policy, you have to create a pair of "Access keys". You can find this in the AWS Management Console under the "Security Credentials" tab of the IAM user. These credentials are required for authentication (with the Signature Version 4 signing process).
After creating your access and secret keys, you will have to install the AWS CLI (if you have not installed it previously).
You can then run the command
aws configure to set your Access and Secret keys. I have attached a screenshot that depicts running this command.
Once you have set your credentials, you should have the proper authorization required to interact with the resources you have created.
I hope this helps to fix the error you were receiving.
Please let me know if you have any other questions! Have a great rest of your day.
From the ARN displayed in the error, it appears that the "managedblockchain:GetMember" policy is not set for the IAM user you are using.
Presumably you are not logging into AWS using the AWS IAM Identity Center.
So, you need to attach the necessary policies to the IAM user.
Attach the policy to the user "our_new87" by following the steps described in this document.
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