What does it mean “the link has been connected”?
If you get the notice 'You are not be allowed to connect the link which has already been connected to Yoycol' during app installation, it means the store you want to integrate with belongs to one Yoycol account. If you are not the store owner, please contact the store owner to solve. And If you are the store owner, please check your Yoycol accounts whether the store has been connected to one of them. If there is one account connected to the store, you can remove it to connect to a new account.
And if you don't find any accounts connected, you could check your installed app/plugin list. If the app/plugin is installed, you can delete it to re-connect.
Take shopify as an example:
If the problem is not solved by both two methods, please contact us.
