There may be a delay in points being received, depending on the state of your connection to the network and other potential factors.
Points may be received if you wait awhile to access the page or restart the app and/or your device, so please give that a try.
Note that you can also check your points and redeem them for rewards on the My Nintendo website (https://my.nintendo.com/).
Please log in using the Nintendo Account you have linked to Fire Emblem Heroes when you check them.
If the above does not resolve your issue, please contact Customer Support via the Inquiries form at the bottom of the page.