I don't understand what I'm doing wrong

Adobe may have detected suspicious account activity and blocked the account to perform an audit.

These things can trigger an account block.

1) Unusual sales or refunds.
2) Unauthorized use of protected Brand Names in keywords/descriptions.
3) Content spamming. Using multiple accounts to artificially boost sales or bypass submission limits.
4) Complaints / 'Take Down Notices' from customers or 3rd parties.
5) Violation of Stock Contributor Terms. See below.
https://helpx.adobe.com/stock/contributor/help/submission-guidelines.html

Contact Stock Contributor Support: https://contributor.stock.adobe.com/contact

This matter is solely between you and Adobe Stock, not fellow Contributors in this user-to-user community.

Be patient. It may take several weeks for an investigation to conclude. Check your email spam folder. If requested, provide additional information directly to Adobe Stock. Work on other projects. Submit content to other stock services.

Good luck.

This IS your warning. Adobe is now investigating your account, and that could take days or it could take weeks. If they find no egregious violations of the T&C's, your account will be restored. If the violations are serious enough, your account might be permanently suspended.