When trying to reach webpage secured by hCaptcha Cloudflare anti-DDoS/Anti-bot protection under web isolation mode, client gets constant human verification loop and not able to see the site's content.
Web Isolation: 1.13, 1.14, 1.15
WORKAROUND FOR WEB ISOLATION 1.13-1.15 VERSION:
Create a rule and PASS for the website that uses hCaptcha. Please go to Threat Isolation Management > Policies > <your policy> > new or existing rule. Fill in the destination URL address and set Action to PASS.
Then activate the new rule by Pushing the settings:
NOTE: Action mode PASS will make the URL transparent to Web Isolation.
FINAL SOLUTION
Migrate to the cloud Web Isolation 1.16 which have a browser impersonation patch implemented for WI CLOUD instance.