Member invitation not working

I’m trying to invite Cloudflare account [email protected] as member of my another account. The popup says invite was successfully sent (screenshot below), but nothing arrives to my email box, so I’m unable to accept. How do I proceed?

Does that [email protected] account here have its Communication preferences set like this in their Profile?

No:

Also, Spam folder is empty

Please open a ticket from the [email protected] email address and post the ticket number here. Send to: support AT cloudflare DOT com