I cannot find my app on AdMob for linking

[app tarou]

Subject: App Store Connect app not showing in AdMob "Add Store"

Issue: App doesn't appear when searching in "Add Store" feature.

Details:
- App Name: 戦国時代クイズ~戦国時代の問題を解いて天下を統一しよう
- App exists in App Store Connect with all information filled
- Status: "Needs Review" in AdMob, "Ready to Submit" in App Store Connect
- Error: "No ad to show" when loading ads

Please advise how to link the app manually or resolve the search issue.

Thank you.