Activation email not sent to specific email address

[i_Supp]

Hi,
Failed to add two specific email addresses. An activation email was just not sent to them.
According to a check in the firewall, the email is not blocked and does not enter spam. IPs 198.2.179.123, 198.2.179.168 and 198.2.179.86 already in whitelist in FW. I also do not see any attempt in logs to open incoming session from these addresses. 
All other users in the same domain have successfully activated their accounts.
I also have two extra licenses so it is not a problem of licenses.

[Bort]

Hi @i_Supp 

To get assistance with this, please contact Zoom Support, who can check the status of those emails from our side. 

[Dave0071]

Is the issue resolved? reg

[RN]

Hey @i_Supp @Dave0071  please refer to the Knowledge Base Article on Not receiving emails from Zoom, please read over all details.

After you've checked IP addresses and spam filters, and confirm that users still aren't receiving activation emails, you can submit a request to Zoom Support to check if the email address is on a bounce list.