How to obtain the required OAuth scopes for LinkedIn Posts API?

I am working on integrating the LinkedIn REST API to publish posts on behalf of both members and organizations. Specifically, I need to use the following API endpoint:

POST https://api.linkedin.com/rest/posts

According to the documentation, this requires the following OAuth scopes:

• w_organization_social
• r_organization_social
• w_member_social
• r_member_social

I have checked the LinkedIn Developer Portal, but I am unable to find which product or permission settings grant access to these scopes.

1. Under which LinkedIn Developer product can I request these scopes?
2. Are there any approval steps required from LinkedIn to gain access?
3. If these scopes require elevated access, what is the process for requesting it?

Any guidance from those who have successfully integrated LinkedIn's posting API would be greatly appreciated.