I need to create a link/button to login to salesforce community from external web application. My requirement is external web app needs to be the IDP and OpenId connect should be used as provider type. Due to technology preference, I have to use OpenId only, not SAML.
Looking all the similar posts and salesforce documentation, I am able to create a SSO button in community login page (using Auth provider), which takes me to 3rd party application for login and finally allow me to get into salesforce community.
But instead of community login page, I want that button to display inside the external app, so that user logged in to the external app, can directly login into community without navigating to community login page.
I have referred to the following which are really not helping my problem - https://developer.salesforce.com/forums/?id=906F0000000BMZBIA4

Hi All,

I am not able to complete Apex Specialist Super Badge Chlallenge, getting this error "Challenge Not yet complete... here's what's wrong:  The Case object has not been renamed to 'Maintenance Request'." but I have already renamed the tab names because we cannot change the API name we can only change the lables.

Please help me in this.

Thanks in Advance,
Javeed Shaik