Scheduling and managing events using Outlook.com calendar
Dear Vicky Thank you for the quick response!
Great to know you use OWA on the phone. As a further troubleshooting for Outlook Web:
Clear your browser's cache and cookies, which can sometimes interfere with web app functionality. Access Outlook web using a different browser to rule out browser-specific issues. If you use Outlook web on multiple devices, ensure sync processes are complete and there are no errors.
Kind regards -Adedayo