Adobe Stock Rejection issue

Re-read the Stock Contributor User Guide carefully.

https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/design-template-requirements.ug.html

Were you invited by Stock to contribute Design templates?

Note: Design templates are not currently accepted through the Contributor portal.  For now, our collection of design templates is by invitation-only and represents a relatively small group of artists and agencies. Over time, we may be expanding them to include a broader group of contributors.

As the message says, you have IP issues!

You should fill out a form saying you are the creator of the design. Make sure you don't have any logos or other IP issues in your design that are owned by another company.

Also, we can't see your file. This is a user-to-user platform.