It always amazes me how people can read a blog post like this one that has a clear description of the problem with a log excerpts demonstrating the problem, and then people will confidently make up a completely different scenario that was not mentioned at all and blame the problem on that.
WTF you talking about? Rene, this is defamation and I'm probably going to take action because honestly, enough is enough. I'm fed up of folk like you who lack basic technical knowledge or any knowledge making up bullshit. Your hourly rate makes me like you have money to take.
It amazes me people read that in this community and don't know for an email to bounce it means it didn't find an inbox. If it didn't find an inbox how did he check the logs?
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.