When you try to add an agent that is already registered in Toky from your account or in another Toky account, you will get an error message like this one:
If john@company.com is already registered somewhere else in Toky, you can still add in john@company.com using john+toky1@company.com. The tag toky1 we used in this example can be changed for any text of your preference.
Note: Both email addresses john@company.com and john+toky1@company.com are the same for your email server/service. This is the reason that this workaround will function just fine without any change on your side.