What is the name of the domain?
bihr.buildking.hk
What is the issue you’re encountering
turnstile does not allow login when verification successful. It happened suddenly last week. has the api.js script been updated recently?
Was the submit button disabled or how did you implemented your “login method”? 
Are you using Turnstile via some plugin or?
Well, its just an html login form with turnstile script and “div class=“cf-turnstile” data-sitekey=“your-site-key””
the login logic uses windows authentication. the website connects to a Qlik server.