Facebook Group posting Issue

 ASLGT  4th Feb 2022

I am applying for the Facebook Group auto posting. When I'm creating my video for approval; I am getting this error while posting:

 (#200) If posting to a group, requires app being installed in the group, and \ either publish_to_groups permission with user token, or both pages_read_engagement \ and pages_manage_posts permission with page token; If posting to a page, \ requires both pages_read_engagement and pages_manage_posts as an admin with \ sufficient administrative permission

My App is still not visible in group's app-list.

Please help me to proceed further.