Make sure you're the first person to land on the meeting link.
Advice is to not use a link, use a codeword
Keep the link invisible until you have already joined the meeting then share it with others.
Generate a new link every time you need to create a meeting. This Help Center article shows how to reset the link in your Classroom.
ALWAYS be the last person out of the meet as the link/code becomes invalid once a teacher leaves
Do NOT create a calendar invitation to a meet as the link is ALWAYS active