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The Adobe Moderator gave you the reason for rejection, which I'm sure is "Technical Issues". It's underexposed, poorly composed, very noisy, unfocused and has a White Balance problem. Please read all of the very helpful information on the Support pages so that you'll understand the quality expectation for Stock images:
Let me just show you some problems:
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
When zoomed in at 200% this is how your subject looks. There are multicolored grains and other noise grains that are visible. Also for the purpose of cropping the subject from the background, the edges must be sharp, hence good focus. Low lighting and underexposure will make sharp focus more difficult as well as producing excessive noise grains.
Photographer and Nutrition Author
Your photo is too dark and is very noisy.
You should also remove undesired background.