How to untie an unnecessary account from Viber?

Question

Backup

Greetings.
I mistakenly linked the mail of a relative to the work number (on the screen it is on top).
Then I attached corporate mail. The essence of the problem is that now in the menu Settings - Account - Backup - Select an account for the Viber service, 2 mails are displayed (both gmail, let me remind you one of them is corporate):

Screen

I unlinked both mails from Google Drive and deactivated the viber.
However, even when reinstalling, it pulls by default the mail that needs to be removed from this list. What other options are there?