Ask HN: What can I do to avoid being forgotten by MSFT (hiring process)?

I'm a mid-level software engineer myself, and have had troubles applying to MS which is one of the big tech companies I'm interested in joining. But I've been having some odd experiences with them, and asking people who are familiar with the Redmond WA jobs, or have worked there before, to help shed some light on it. I've drawn interest from MS recruiters to apply to the company, but could never get into the interviewing rounds.

In mid 2016 I was contacted by a Talent Acquisition Specialist from MS. First via LinkedIn, then it went to email. The TAS told me to do three things: RVSP to a company hiring event (in the Redmond WA area) from a link she sent to me, apply to some positions at departments of my choice, and fill out a pre-screening form. I did all three, and when I asked when I could expect a response, but I never got one.

This scenario repeated itself again in 2017, with a different TAS, except there was no pre-screening form. But he was late in replying, to the point where the hiring event already ended before they could move me into the interview process. There is no phone number listed in their emails to call them at, and they just keep failing to reply to my messages via email and LinkedIn. (and yes they still work in Microsoft last time I checked)

So why is this happening, and what can I do to make sure they reply more quickly to me and I won't get forgotten?