Unable to start or create instances due to Docker error code 125. (v2.6)

Since that was a decently large version jump to make while updating, double check that ampinstmgr version in CMD prints out the expected AMP version. If it doesn’t read the new version, follow this guide here and be sure to follow the section regarding updating your CLI tools.
https://discourse.cubecoders.com/t/how-to-update-amp-to-the-latest-version/2297

If that all checks out, some people having issues with Docker on Windows had to downgrade their Docker Desktop version to 4.39, so that may be something to double check.
(With the older installer you’d have to run .\Docker_Installer.exe install --disable-version-check)