[pfranz]

They stopped doing that with Sierra:

"macOS Sierra or later doesn't appear in the Purchased tab. Instead, use the Search field in the upper-right corner to find and open the App Store page for the current version of macOS."

https://support.apple.com/en-us/HT201272

[jasomill]

Note, however, that if[1], and apparently only if[2], you’ve downloaded Sierra from the App Store in the past, you can install

https://github.com/mas-cli/mas

and then use the command

    mas install 1127487414

to download the latest Sierra installer from the App Store.

[1] It worked for me.

[2] Or so I’ve heard.

[pfranz]

Thanks a bunch! I downloaded and stashed a copy of Sierra when it first came out, but I recently bought a new Mac that came with Sierra (likely a point release and 10.12.0 likely won't install). I can restore from a netboot, but like having something I can put onto a USB drive.