You are correct because TurboTax has a webpage
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/e-file-1040x-amend-return/L9t...
that states 2023, 2024, and 2025 (2025 1040-x can't be efiled as of now because the form i s not ready) amended returns can be e-filed. When taxpayers have issues, it seems support is clueless. Thus, they are unable to e-file. The page does warn that there may be certain situations where you can't e-file
It used to be that filers only had until the extended due date for that year to e-file an amended return. After that, TurboTax closed e-filing for that year. You'll note the date on the page as January 2026. So this is a recent change. Don't know what to tell you because maybe an update is needed, which may never come.
