If your content has not been published on Reddit, there may be a variety of reasons. First of all, the Reddit community is based on very strict rules and a very special scoring system for sharing posts.
Each Reddit member receives "Karma Score" depending on how well links and posts are rated by the Reddit community. If your posts get likes and upvotes from your Reddit community, you will receive positive karma. The more upvotes you get for your posts, the better your posts are ranked on the Reddit boards and the more posts you are allowed to share. To share your posts in a subreddit on Reddit, you need a certain "Karma Score".
When you share posts on Reddit, you have the option of sharing a link-post or a self-post. Self-posts are based on text-only and link-posts are posts based on a link.
Likewise, there are two different kinds of karma, link karma & comment karma:
You do get link karma for link posts, and you do get comment karma for comments posted in a thread of your post. However, while people can upvote or downvote self-posts, you don't get any karma for them. But if they comment on your self-post, you will get karma.
In any case, the voting you get will affect the ranking of your posts. The more upvotes you receive for a post the better this post is ranked when people sort a board by top posts.
If the link-posts or self-posts are downvoted, the (general) karma will also decrease.
The number of a "karma score" needed to publish posts in subreddits can vary between the different subreddits. Therefore, it is advisable to take a close look at the subreddits in advance and familiarize yourself with the rules within the individual subreddits, because: each subreddit follows its own rules.
Some subreddit communities allow, for example, to post only images or to publish with a certain karma score. Other subreddits allow only one post per day and user.
Example:
Subbreddit:"WorldNews"
Requirement: Link / Comment karma of min. 10
Disallowed submissions
US internal news/US politics
editorialized titles
misleading titles
Editorials, opinion, analysis
In addition to the regulation of Karma points, the general API Ratelimit of an OAuth2 connected user can also be responsible for a failed posting. The API Ratelimit equals 60 requests per minute.
The API Ratelimit should not be confused with the "Submission / Comment-Ratelimit".
On Reddit, users cannot quickly post in succession like they can on other networks. An exact time, how often it is allowed to post to Reddit, cannot be determined. The Reddit-Wiki gives the following information: With low karma, a user can post 1 post/comment every 10 minutes. Rising karma increases this rate.
More information:
https://www.reddit.com/wiki/index