"400: Session Invalid" Error When Connecting Instagram

This guide will walk you through resolving the “400: Session Invalid” error while connecting your Instagram account to LinkPlease or other third-party platforms.

Reason 1: App Permissions Conflict

Sometimes, your Instagram account is already connected on Instagram’s side but not reflected in LinkPlease.

Steps to Fix:

  1. Open Instagram in a browser (preferably mobile).

  2. Go to Settings → Security → Apps and Websites
    Find the list of apps connected to your Instagram.

  3. Look for LinkPlease (or the platform you’re linking).
    Check both the Active and Expired tabs.

  4. Click Remove / Disconnect
    Remove the app from Instagram’s connected apps.

  5. Return to LinkPlease and reconnect Instagram.

Reason 2: Browser Cache or Cookies

Cached data or cookies in your browser can block Instagram authentication.

Steps to Fix:

  1. Open an Incognito / Private Browsing window.

  2. Log into Instagram and LinkPlease again.

  3. Try reconnecting your Instagram account.

  4. If incognito mode doesn’t work, clear your browser cache and cookies manually.

Reason 3: Using the Wrong Device or Network

Instagram’s API sometimes behaves differently depending on your device or network.

Steps to Fix:

  1. Try switching devices, e.g., connect via mobile instead of desktop (or vice versa).

  2. Switch your internet connection, move from Wi-Fi to mobile data or use a different Wi-Fi network.

  3. Attempt to reconnect Instagram again in LinkPlease.

Reason 4: Instagram Account Type Mismatch

Some third-party integrations require a Business or Creator account instead of a Personal one.

Steps to Fix:

  1. Open Instagram Settings → Account.

  2. Check your account type (Personal, Creator, or Business).

  3. If needed, switch to Business or Creator and try connecting again.

  4. Log out and back in to refresh permissions.

Reason 5: Expired or Invalid Tokens

If Instagram’s access tokens expire, LinkPlease can’t authenticate your account.

Steps to Fix:

  1. Disconnect Instagram from LinkPlease.

  2. Reconnect your account to generate a fresh token.

  3. If the issue continues, remove LinkPlease permissions from Instagram first (Reason 1) and then reconnect.

Reason 6: Temporary Instagram API Issues

Sometimes, this error is on Instagram’s side and fixes itself automatically.

Steps to Fix:

  1. Wait 30–60 minutes before retrying the connection.

  2. Try again later from a different browser or device if needed.

Reason 7: Contact Support

If none of the above steps work, contact support for assistance.

Steps to Fix:

  1. Click Support in LinkPlease.

  2. Click New Conversation and describe your issue.
    Example: “Hi, I’m getting a 400: Session Invalid error while linking Instagram.”

  3. Click Send
    The support team will assist you ASAP.

You’ve now tried all fixes, clearing permissions, refreshing tokens, checking account type, and reconnecting.
If the issue still persists, it’s likely an Instagram-side bug, so wait and retry later, or contact LinkPlease Support for further help.

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