Identity Provider - okta password verification

I have configured “Identity Provider” for google authentication. Globally, all is working fine BUT, I don’t understand why I have to “verify” Okta password after valid google authentication.
To be more precise, I have to provide my admin password throw an http form with url:
Thank you in advance for your help.

I would take a look at your Sign On Policies (Security > Authentication > Sign On) configured as it seems it’s being triggered for these users as well.