As an accounting expert from Buddy Assignment Help, I understand the frustration you're experiencing with e-filing an amended tax return for 2021. It's crucial to ensure accuracy in such matters to avoid any potential issues.

Firstly, double-check that you've completed all necessary steps and entered the correct information accurately. Reviewing the IRS guidelines for filing an amended return can provide clarity on the process and requirements.

If the option to file as an amended return is not appearing, it could be due to various factors such as incomplete information, errors in the original return, or technical issues with the e-filing system.

I recommend reaching out to the IRS directly or consulting with a tax professional to troubleshoot the issue further. They can provide personalized guidance based on your specific situation and help resolve any issues preventing you from filing the amended return successfully.

Additionally, if you require further assistance or guidance with accounting-related tasks, feel free to reach out to Buddy Assignment Help. Our team of experts specializes in accounting and taxation and can provide personalized support to ensure your financial matters are handled accurately and efficiently. You can find more information about our accounting assignment help services.

Remember, accuracy and attention to detail are paramount when dealing with tax matters, and seeking expert assistance can help alleviate any concerns or uncertainties you may have. Don't hesitate to reach out for assistance, and best of luck with your amended tax return filing.