I have two IG accounts share an email that I used to be able to switch between in app yet now one of them doesn't show up, and regardless of what password I use, it logs me into the same account. I can't even attempt to log into the other since it shares the same email and apparently IG doesn't have any live customer support or any way to get in touch with a human. Furthermore, the site and app have bugs that make it frustrating to use. Ultimately it makes me not want to use IG period. It's clear they don't really care about its users.
