Here are 3 tracking IDs from this morning with 404 errors, all with the “1001: User does not exist” error code:
v=2.0;clid=us06;rid=WEB_3ded153a20c8d1a47fbd409db0590574
v=2.0;clid=us06;rid=WEB_4d9dca36f0aa521e8a0b21ca61bc6b51
v=2.0;clid=us06;rid=WEB_3df22ed3db5fe0b57d421105674e0da1
All 3 are POSTs to the endpoint webinars/{webinar_id}/registrants
All 3 contain email addresses which are not already registered to the webinars, though may have been registered for other webinars.
The requests are to 2 separate webinars, ids 88103772725 and 86836646266, each 3000-attendee capacity and less than 500 registrants for each, most of whom have been registered successfully with the same endpoints.
I have 71 failed registrations for webinar 88103772725 and 85 failed registrations for webinar 86836646266.
I’m not sure what other information I can provide, but please let me know what might be helpful.
That said, by far the more prevalent error (4x as often) is 429 Too many requests, described elsewhere. Just in the past 2 hours, 16 registrations have failed to post with 429 errors.