When ads are created in Facebook, the ad does not automatically appear as a post on your Facebook page. This is the same with ads created via Pinpoint.
If you want to post your ads to your Facebook page follow these instructions:
Note that you will need the page permission of 'Publish Content' to create posts on your page in order for this to work.
Firstly, login to your Facebook Business Manager account.
Next select Page Posts from the main menu:
You'll then see a list of all of your ads. Select the ad you want to post to your page, by ticking the box next to it. Then select the 'Actions' dropdown in the area above and click 'Publish':
And that's it, your ad will now appear on your page.