Could not create advertisement
Admin ads API returned Could not create advertisement. (couldNotCreateAdvertisement) when creating an ad fails.
Why this happens
Validation, placement conflict, server error, or CSRF. Distinct from list load failures and update failures (Phase 70).
Diagnose and fix
1. Refresh Admin → Advertisements; retry with a valid placement/position.
2. Disable a conflicting enabled ad for the same slot if prompted.
3. Check Network error / CSRF and retry.
4. See Advertisements (ad slots).