Website not appeared on Bing and Duckduckgo but shows indexed on the webmaster tools

if it's adult, bing won't show them unless you're super big.

I would double-check that your site has no noindex tags or robots.txt blocks, as a mismatch between tools and live results is common.

Indexed in Bing Webmaster Tools means Bing knows the URL; it does not guarantee that the page will appear for a query. Since you mentioned robots.txt blocks, first confirm that the affected URLs are not disallowed. Then check the live URL response, canonical tag, noindex status and exact-URL search. DuckDuckGo mainly relies on Bing and may lag. After correcting any accidental block, resubmit the sitemap and request inspection for one canonical page, then allow a few crawl cycles before comparing results.