*Update - the IRS will be adding a Recovery Rebate Credit to all of their 2020 1040 forms to help people who either didn't receive a Stimulus payment or didn't receive the correct amount.

If you need to call the IRS, I find that after 5pm EDT I can get through.

The amended return was mailed to the IRS on August 24th and, like yours, is not showing received, although the message on the site indicates that it should not take longer than 3 weeks to be added to an individual's record.  My friend is planning to call the IRS this week at 800-829-1040 to try to track it down and I will be happy to keep you updated as to her progress.

As I wrote earlier, calling the IRS at 5pm EDT, seemed to work.  Unfortunately, since it is not my return, I am unable to call on behalf of my friend.

Wishing you the best of luck.  I will keep this message string updated.