Restore Missing Outlook 365 Calendar

I'm looking for an experienced Outlook 365 professional to help me recover my missing master calendar on my personal account.

Requirements:
- Expertise in Outlook 365, particularly with personal accounts
- Ability to troubleshoot and resolve missing calendar issues without error messages
- No recent changes were made to my settings, so the solution should be straightforward

Ideal Skills and Experience:
- Proven track record in resolving Outlook 365 issues
- Strong understanding of Outlook calendar functionalities
- Excellent problem-solving skills

Please provide a brief overview of your approach and estimated time to resolve this issue.