Given: a User without the password credentials is created in Okta via api call.
When User clicks activation link in the Welcome email, User is redirected to the ‘Complete registration’ Okta page. That page contains fields for password, password confirmation and security question. It seems that the only customisation that can be applied to this page is company logo and company name. Are there any other look-and-feel customisation options available for that page? Any custom css styles that can be applied?
My name is Fabian from Okta Customer Support and I'll be helping out on this ticket. You cannot customize the activation page unfortunately. I don't know if this helps, but you can create a custom sign in page for the end users. I added a link with more details below.