Why does my discourse do not have Invite button?

My discource is set to use SSO provider is that reason why there is not Invite Button at end of topic?
Or I need to enable invite somewhere else ?

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Here’s what the “enable_sso” site setting’s description says

Enable single sign on via an external site (WARNING: can prevent anyone from logging in, INCLUDING YOU, if not properly configured when enabled! Also disables invites)