I'm experiencing this, too. I'm trying to download manifests from A Hat in Time, but for some reason it can only download builds from the main public branch. Any side branch that has had manifests pushed to public cannot be downloaded. Gives the same error. Example manifest that works: 7990470922813452096. Example manifest that doesn't work: 3272769937832693683.
Same exact issue as OP, also for stardew valley. I'm trying to fetch from the compatibility branch. I'm on MacOS however, so this is not strictly a steam-for-linux issue.
i also have this problem when trying to download stardew valley compatibility version linux. Does the CDN has any issue?
Nothing extracted yet.
I'm trying to download the Linux version of Stardew Valley using the command download_depot 413150 413153 7765457731394665657, but it only returns an error message:
Depot download failed: error downloading manifest 7765457731394665657 from cache6-gru1.steamcontent.com (Access Denied)
Depot download failed: error starting download for depot manifest 7765457731394665657
I've already reinstalled Steam, run it as administrator, asked a friend to run the code and it still gives me an error. On YouTube I found comments about the same difficulty of not being able to download.
I opened a ticket on Steam and was told to ask for help on this GitHub page.