E-filing amended returns - 2020 and 2021

Hi Greetings, I was able to successfully e-file 2021 amended return,  but am having trouble e-filing 2020 amendment. While turbo tax 2020 desktop version  says   "New as of August 2020! You may be eligible to electronically file your  amended return. If you'd like to file electronically , click on the "File" tab to proceed.

Now I do not see any e-file option in File tab. How can I file my 1040-X for 2020 electronically.  Note that I was able to attempt to e-file once in turbo tax online for 2020 but it was rejected due to some clerical error ( as how I understood). So I am thinking the option is there but hiding somewhere. Sending a paper return, I will never have proof of submitting the return. Note that I filed 2021 amended return successfully

 

Is there any one that can help?