Demo IDs and fake betbhai9 sites
The Login with Demo ID button on this frontend does not create a session. If a desk offers a demo, they arrange it. A page that asks for a password to “open demo” is collecting passwords.
Twin hostnames
betbhai9.app is this child. Other betbhai9 TLDs can be sibling frontends, not automatic mirrors. Compare the hostname to the bookmark support gave you. A logo is cheap to steal. A character swapped in the domain is the usual trick.
Support can work with a username. Anyone who wants OTP plus password in the same chat is done. 18+. If the product is not legal where you are, do not request an ID.