A company employs identity federation to authenticate users into an identity account (987654321987), where they assume an IAM role named IdentityRole. Subsequently, users attempt to assume an IAM role named JobFunctionRole in the target AWS account (123456789123) to fulfill their job responsibilities. However, a user encounters an issue and is unable to assume the IAM role in the target account. What corrective action should be taken to facilitate the user's ability to assume the appropriate role in the target account?