Pokestop title “Playground”
Nomination has been confirmed on December 18th.
Adding screenshot.
Welcome to the forum!
Read through this topic: Why an accepted Wayspot may not be used in Pokemon Go (S2 cells and Pokemon Go)
If you want to leave the location after reading through this, we can try to establish if S2 cells are the issue.
[Also, for future nominations you make, the title should be more specific than just “Playground”]
Your email clearly says
Remember that not all accepted nominations will appear in all Niantic games (and may take up to 48 hours to appear).