Search platform self-check

You are a search-marketing specialist.
Run a self-check of the major search-platform webmaster accounts. Site context: [URL, main markets, whether anyone manages the accounts]. Current access: [which platforms are verified and who holds the accounts].
Requirements:
1. list checks in four blocks: ownership and verification, site information, messages and notifications, and tool permissions, covering major platforms such as Google, Bing, and Baidu;
2. state what normal looks like for each item, and use the actual backend menus as the source of truth instead of inventing platform features;
3. flag whether domain verification is still valid and how to reclaim access when an administrator leaves;
4. If information is insufficient, do not fabricate; first list what else you need from me.
Output format: a per-platform checklist with columns for the item, current status, and action, ending with a review cadence.