Social network is not good for the poor guy. I already regret replying to him in the first place but I cannot delete.
Comments like this are why he's just landed himself with a major liability and I bet he'll be getting sued over this.
TFA shows an excerpt from the email log for his google workspace account, showing the bounce of email sent from viva.com.
Then, TFA states that he switched "the account" (his viva.com account) from using his GWorkspace address to a personal @gmail.com address, and asked viva to send another verification email. That one arrived.
At no point does TFA describe the author themselves sending a test email.
It amazes me that you can read an article and draw the exact wrong conclusions