User linking was disabled

I want to login me on my okta administration interface .
But when i submit form i’m redirect to 400 error :
error code: access_denied
Description: User linking was disabled.

what’s means “User linking was disabled” ?
My profile is active and linked to my application

Are you using a social provider for federation?

Account Link Policy: Determines whether your Application User should be linked to an Okta user.

Automatic: Link user accounts automatically according to the "Auto-Link Restrictions" and "Match against" settings.
Disabled: Do not link existing User accounts. Unless User is already linked, login will fail.