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Error 400 Session Invalid when connecting to Instagram

This issue occurs on Instagram's end and is not related to the service.

Possible Solutions​

Deleting the Postmypost app from Instagram​

  1. Follow the instructions - How to delete the Postmypost app from Instagram.
  2. After that, you need to reconnect your account to the service.

Logging in via two tabs​

Follow these steps on your phone or PC:

  1. Open two tabs in one browser window.
  2. Open Instagram in the first tab, and the Postmypost service in the second.
  3. Log out of the first tab if you're already logged in, and then log back in (this will refresh your browser session).
  4. Then, go to the Postmypost tab and reconnect your account.

Use a different browser​

If both options don't help, it's important to try connecting in a different browser or try again later (in the evening or the next morning). This error occurs spontaneously on Instagram's end and resolves itself over time.