It doesn't matter whether you want to believe it or not. I wrote freescale, but it's actually incorrect. Freescale is not on the list. I've been running around trying to find someone to invite me into the workspace until I finally lost interest. Here's the slack link:
https://zephyrproject.slack.com/signup#/domain-signup
You can use any account with the domain:
intel.com
linaro.com
linux.intel.com
nordicsemi.no
nxp.com
oticon.com
foundries.io
ti.com
synopsys.com
antmicro.com
sifive.com
teenage.engineering
lairdconnect.com
adafruit.com
eclipse-foundation.org
google.com
chromium.org
windriver.com
Don’t have an email address from one of those domains?
Contact the workspace administrator at Zephyr for an invitation.