What happens if

What happens if i disable the SSO from wordpress ?
Can user still login with their credentials ?

If your users exist in WordPress and are being signed into Discourse from WordPress identities, then Discourse will have user accounts with email addresses, but no password.

Once you disable SSO within discourse each user will need to conduct a password reset.

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There is a migrate password plugin. It is conceivable that you could migrate the passwords to discourse, but I’m not aware of anyone who has done that except when doing an import.

I probably should have added that if you enable a different SSO source such as Google, then any users with a matching gmail account can continue to sign in without impediment.