Problem with affiliation

[GAMINGISEROIS]

Describe the solution you'd like

Problem with affiliation, let me explain:
When someone gives their affiliate link to someone else and they click on it, if they are already registered and even a customer, they can take advantage of the discount, the link cannot be removed even by disconnecting and reconnecting ... It's annoying and useless at the same time, because the person gives the link and even customers who already have services can use the discount... What's more, when you place an order with the link activated (because you can't remove it anyway), the emails aren't sent and neither are the invoices...

Describe alternatives you've considered

No response

Additional context

No response