not receiving confirmation email to get link to sign in a meeting

I've been using Zoom almost weekly for at least 6 months and have had no trouble getting in the meeting.  I pay for the meeting then I get another email to Register my name etc.  Usually after I registered I receive an email that has the link to join the meeting.  The last two weeks I register, the email disappears and I never receive the email to join.  Very frustrating since I pay for these and they are non refundable.  Nothing has changed, same computer and email. Help!