i copied your given script and i paste in my website see in the attachment after that i checked on my website and search any name but still no check availability working.
<script src="https://widgets.upmind.app/dac/upm-dac.min.js"></script>
<upm-dac
order-config-url="{https://7xqjnwdwuvcn.upmind.app}"
currency-code="{USD}"
></upm-dac>
See this i just pest like this