Failed to verify the credential: User: arn:aws:iam::<roleid>:user/assume-only-user is not authorized to perform: sts:AssumeRole on resource: arn:aws:iam::<roleid>:role/<rolename>
The Cloubdreak instance is not authorized to assume the role that you are trying to register for the Cloudbreak credential.
How to fix:
If you are using hosted Cloudbreak, you may be entering an incorrect AWS account ID when creating the role for Cloudbreak credential. Contact the Cloudbreak team to confirm the AWS account ID.
@Dominika Bialek This was helpful. As a follow up to others who may see this, you have to use the fully qualified name