Cannot amend 2020 return on Mac desktop turbotax

[369lisa]

Cannot find a away to amend the return if I open up by 2020 file. If I choose amend a return, it opens up to new file and my 2020 data is not pulled in. The online answers and solutions are not helpful, since it keeps on telling to open up my 2020 return, then choose amend a return - and I cannot find that option. I was on the phone with turbotax agent, she could not assist, then hung up on me. Please assist. Are there issues with MAC DESKTOP versions? (I was able to amend my returns before 2020 using prior Mac desktop versions.)

[MichelleLO]

Please reach back out to TurboTax Customer Support and request assistance with amending a return with a MAC.

What is the TurboTax phone number?