Recently, Instagram discontinued the Legacy API permission (“Basic”) and introduced Instagram Graph API and Instagram Basic Display API. We have updated our BlossomThemes Social Feed plugin with the new API.
To display your Instagram posts on your website, you need to authenticate the plugin to access your media and user information.
If you are using the Jetpack plugin, please deactivate it temporarily. The authentication process will fail if you are interrupted to enter your login credentials.
Besides this, also make sure that you have published at least one post on your Instagram account.