Hi @DmytroCommunity,
I'm so sorry to hear that you're seeing an error, and that you've had difficulty contacting Customer Service. I'll definitely try to help.
There are a couple of possibilities that I can think of.
The first one is that though there's a generic error showing instead of the usual, more descriptive one, the problem may be that the email address has been used on a different account. In this situation, Customer Service would be needed for looking into whether that account is one you control or not, and if not, if it's one that has not been confirmed or used. If it's one that is not confirmed or used, it's possible that someone typed in the wrong email address at account signup, and the teammate may be able to forward it for review to possibly be closed. (I recognize that you've had difficulty contacting Customer Service through the Contact page. Can you describe the issue that you're having getting through?)
Another possibility is that, if the domain type of the email address is not of a type that is traditionally seen (such as .com, .net or any of the other kinds typically seen), the domain suffix may not be supported. For security reasons, please don't post the whole email address here - but if it is a less well-known type of domain, it's possible that it may not be able to be used.
The last possibility that comes to mind is that there may be a space, before, after, or within the email address you're trying to add. If that is the case, it may be causing the error.
I hope this information is helpful!
Olivia
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