1) Insufficient significance
The person or brand is still little known. There is little or even no mentions of them in the press, publications in the media, which prove the importance and scale of activities.
2) Non-encyclopedic style
Wikipedia is an encyclopedia. Therefore, the style should be scientific and clear, without epithets, comparisons, advertising phrases, praise and evaluative judgments.
3) Non-authoritative sources
Wikipedia has clear definitions of which sources to consider authoritative. Thus, if your PR managers post news in the sections of special projects, press releases and so on, it will not work. Your site is also not AS.
4) The article was created with violations
Over the years, Wikipedia has developed numerous rules and criteria. For example, it is forbidden to write about yourself or your company. This is considered a conflict of interest and a violation of the NPOV. (So if you are not aware of that, it is very easy to break a few rules)
5) The article was created by a participant with zero or very small contribution
If the article is published by a freshman, it immediately attracts the attention of experienced editors and administrators on various violations. Therefore, the chances of surviving of such article are much lower.