A "something went wrong" error at the bottom of the screen when reconnecting Instagram is usually caused by a cached login, not a broken account. Your saved Instagram login on a standard browser is what stops the Instagram page from loading during the connection, and a private window bypasses it.
How do I fix it?
Open a private or incognito browser window. If you have a desktop available, use that rather than a phone.
In that window, go to the Accounts page and reconnect Instagram.
If it still fails in a private browser, email support@scaledcreator.com with a screenshot of the error.