There might be several reasons why AddItem call failed with the API Error Code 21916293 - "Lvis validation blocked" . Usually, the Message tag is also returned along with the Error 21916293, which contains very detailed information about the actual problem and how it can be resolved.
Detailed Description
There are several resons why AddItem may return an error.
Here are a few examples:
There may be a non-performance account
There may be a copyright violation for the account in question
These are returned in the Message tag as below and you can render it as HTML so that your users can take appropriate action.
<Message>BLOCK - <div> <table cellpadding="0" cellspacing="0" border="0" width="100%"><tr><td rowspan="5" bgcolor="#9999CC"><img src="http://pics.ebay.com/aw/pics/s.gif" width="1" height="10"></td><td colspan="3" bgcolor="#9999CC"><img src="" width="1" height="1"></td><td rowspan="5" bgcolor="#9999CC"><img src="http://pics.ebay.com/aw/pics/s.gif" width="1" height="1"></td></tr><tr><td colspan="3" bgcolor="#EEEEF8"><img src="http://pics.ebay.com/aw/pics/s.gif" width="1" height="5"></td></tr><tr><td bgcolor="#EEEEF8"><img src="http://pics.ebay.com/aw/pics/s.gif" width="10" height="1"></td><td width="100%" bgcolor="#EEEEF8"><table cellpadding="3" cellspacing="0" border="0"><tr><td valign="top"><img src="http://pics.ebaystatic.com/aw/pics/tbx/errorSm.gif"> </td><td width="100%" class="error"><b></b></td></tr><tr><td colspan="2" valign="top"><p>Access to your eBay account has been restricted for violations of eBay’s <a href="http://pages.ebay.com/help/policies/seller-non-performance.html" target="_blank">Seller Non-Performance policy</a>. </p> <p>Our top priority is to ensure that eBay remains a safe and reputable place to buy and sell. At this stage, we cannot permit you to continue to sell with this account due to the nature of the policy violations and the number of issues you have outstanding with your buyers. </p> <p>You will still have limited access to your account for 30 days to conclude any outstanding transactions, resolve issues with your buyers and access emails in My Messages. You will also be able to continue to make purchases on this account during this time. However, you won’t be able to list any items with this account. </p> <p>If you require assistance with this matter, please contact <a href="https://signin.ebay.com/ws/eBayISAPI.dll?SignIn&UsingSSL=0&pUserId=&ru=http%3A%2F%2Fcgi1.ebay.com%2Faw-cgi%2FeBayISAPI.dll%3FInlineSelfHelpWebForm%26userid%3D%26UsingSSL%3D0%26siteid%3D0%26partnerid%3D2%26wftype%3D15430375024f6faa%26messageID%3D4ed620cea49cfb6f%26replyTo%3D4ed620cea49cfb6f%26subject%3Db44a1d5b9e1e43f07e2d5be5e168ab9ad0da416d370516ac671041027fc56c86%26bcrumb%3D648d70fc2737c980%26rcode%3Df173ec61867e2b4516b2159d03a4ea35%26instruction%3D%26expirationDate%3D%26err%3D0%26dstURL%3D%26bshowgif%3Dfalse%26bc1%3Ddefault%26bc2%3Ddefault%26bc3%3Ddefault%26bc4%3Ddefault%26bc5%3Ddefault%26bc6%3Ddefault%26bh1%3Ddefault%26bh2%3Ddefault%26bh3%3Ddefault%26bh4%3Ddefault%26bh5%3Ddefault%26bh6%3Ddefault%26history%3Ddefault%26rdir%3D0&pp=pass&co_partnerid=2&pageType=1655" target="_blank">Customer Support</a>. </p> <p>Here’s some steps you can take now: </p> <p>• View emails sent from eBay in My Messages </p> <p>• See all open disputes in the Dispute Console </p> <p>• <a href="http://pages.ebay.com/help/tp/inr-snad-process.html" target="_blank">Learn more about the Item Not Received or Significantly Not as Described Process </a></p> <p>We will review your account again after 30 days. If your account standing has not improved, we may be required to take further action including but not limited to full and indefinite account restriction. </p></td></tr></table></td><td bgcolor="#EEEEF8"><img src="http://pics.ebay.com/aw/pics/s.gif" width="10" height="1"></td></tr><tr><td bgcolor="#EEEEF8" colspan="3"><img src="http://pics.ebay.com/aw/pics/s.gif" width="1" height="5"></td></tr><tr><td bgcolor="#9999CC" colspan="3"><img src="http://pics.ebay.com/aw/pics/s.gif" width="1" height="1"></td></tr></table> </div><font color="#BEBEBE" size="1">{e20023-221225x}</font></Message>