Reasons posts may not appear in the 'Awaiting Approvals' section.
There might be two reasons why your posts aren't going into "Awaiting approval" option.
1) It is important to ensure that the individual with permission to approve the content is not the one composing or scheduling the post. If a user with approval permissions creates the post, it will not appear in the "Awaiting approval" option.
2) Please make sure to select the "team" in the post composer. You only have the approval permission for your team's accounts, not for all accounts. If you choose accounts randomly from 'All accounts' they won't appear for your/anyone's approval.