OWA does not offer online meetings automatically..

Pro tip: if you want notifications for all meetings, not just Teams meetings, use Power Automate to hack Outlook into duplicating all events and force all events to be Teams meetings. Sure it's confusing but MS 365 is confusing and severely lacking on features, but this will send you notifications so you don't look like an idiot failing to attend client meetings because they use Zoom or Google Meet since Teams refuses to help you be organized.