There are some restrictions for brand new accounts that are implemented in the HN software. Sometimes legitimate posts get caught by those filters, but it can t

There are some restrictions for brand new accounts that are implemented in the HN software. Sometimes legitimate posts get caught by those filters, but it can take a bit of time before the community or moderators see those and vouch for them (as was just done here). You can always email us at hn@ycombinator.com any time for help.