If your interviewer hasn’t joined, please stay in the meeting room for a few minutes in case of any delays. Delays can occur due to various reasons, such as technical issues at the interviewer’s end, scheduling conflicts, or previous meetings running overtime. 

Unforeseen circumstances may also prevent the interviewer from joining on time. If no one joins after waiting, you can log out and reach out to your HR team for further assistance. Their contact information can be found in the CC field of your invitation email or on the company's website.