So as it is already above I have a problem with the Instagram livestream feature. Every time I start a livestream there's "you're live", but a second later "livestream finished". I have very good Wi-Fi win, the latest update and the app has already been uninstalled twice, but nothing helps. (If it helps, I have a Huawei p10)
I do not have these issues and exactly the same phone, maybe Instagram blocked your livestream because you might have violated policies once?
No, that can't really be because I've never done an Instagram livestream.