Timing of filing an amended return using TurboTax was, at one time, critical. In prior years, you had to file by the extended due date (10/15) sometimes a few days later if your return was rejected.
See this Turbotax website regarding e-filing amended 2023-2025 returns. This seems to be a recent change.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/e-file-1040x-amend-return/L9t...
Note, you are not the first to post that they can not e-file one of these years amneded return. 2025 - 1040-X won't be ready until Mid Feb 2026
.
