Then you need to edit the UI elements to work with different sites/instances.
So since the site is same but with different accounts your parent/window element should be same. But you should double check that

Open that and check that it doesn't refer to the specific url from your excel list or the account it is logged in as in that site since that changes every loop.
So for example in my picture:
If we assume you would be automating this site with different accounts you would not want to refer to the text "About eetuRobo" since we imagine that it would be different account every loop.

So either you would change the operator to "Starts with" and remove the "eetuRobo" or you would toggle on different attribute to specify this element.

So go through your elements and check that they are not trying to refer to elements that specifies the first account but works with all of them.