Cannot link riot games onto my account

Idk why, but there’s an exception when I want to push my account to link to your service. I’ve done this so many times already. It is just happened on my riot games account and nothing else.

Hi @LaroTayoGaming,

I checked your profile and I see that your current Riot ID is LaroTayoGaming#LTGN. Are you trying to change it?

How do you change it?