2fa not showing for admin

I have enabled 2FA,
Changed the login page etc.

But whenever i login i am never asked with 2fa, just username / password.

I have no error log or anything indicating this is a issue on my side.. but i would ofcourse like to get 2fa working on my site.

Brute force attempts are quite high (following ur security plugin 14k a week).

Hopefully anyone can help me on my way.
Regards,
Marco