SSO - New Employee Talent Centre Access

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Has anyone got any tips / suggestions on how you can accommodate new employees to complete their onboarding activities (within the Talent Centre) with SSO activated?

The issue that we have is that SSO is enabled, which is great for current employees who are setup within the active directory. However, for new starters (who aren't within the AD), they are not able to login manually to the Talent Centre. Instead they are re-directed to the AD login. 

Ideally it would be great if employees who are active within the AD can login to the Talent Centre through SSO. For those new starters (who are not active within the AD), they can login manually.