I made a post and wasn't able to find it in the community. I looked for it and found it in my profile under "My Rejected Items" (https://community.alteryx.com/t5/premod/moderationitemspage/tab/rejected) but no note as to why it was rejected and what I should do to get it posted. I browsed the help and FAQ but didn't find a note about review processes or anything that may indicate what happened there.
This happens when a post is automatically marked as potential spam. The initial mark is automated and is reviewed by a Moderator throughout the day. If this happens to you moving forward, you can always send an email to Community@alteryx.com for a quicker review, or check back on the post later in the day to see if its been published.
