Error 400 shows up during the Instagram connection flow. It usually means something went wrong with how the login was handled between Inrō and Meta, not that anything is broken on your account.
What causes Error 400
You're logged into the wrong Facebook account in your browser.
Your browser has cached login data that's causing a conflict.
You declined a permission during the connection flow.
You're using a browser with strict privacy settings or an extension blocking the flow.
Try a different browser or a private window
This clears Error 400 most of the time.
Open a private or incognito window (or a browser you don't normally use).
Go to app.inro.social and log in.
Go to Accounts → Instagram account and try connecting again.
Log out of all Facebook accounts first
If you're logged into more than one Facebook account in your browser, that can confuse the connection flow.
Open Facebook and log out completely.
Log back in with the Facebook account that manages your Instagram.
Return to Inrō and try connecting again.
Grant every permission during the flow
If you unchecked or declined any permission during the Facebook and Instagram connection steps, Error 400 can appear.
When the connection flow asks what Inrō can access, leave everything checked. Inrō needs access to your messages, comments, and profile to work.
Clear your browser cache
If none of the above worked, clear your browser's cookies and cache for Facebook and Instagram, then go through the connection flow one more time.
Try a different device or network
Sometimes the block is the device or connection, not your account.
Switch devices. If you're on mobile, try a desktop browser, or the other way around. Desktop handles Meta's login flow most reliably.
Switch networks. Instagram occasionally blocks a single connection for a short while. Move from Wi-Fi to mobile data, or the reverse, and try again.
Try the other login method
Inrō has two ways to connect: Instagram Business Login and Facebook login. If one keeps returning Error 400, start over and pick the other. Both are covered in How to connect your Instagram account to Inrō.
⚠️ If the issue persists
Error 400 is sometimes temporary on Instagram's side. Wait 30 to 60 minutes and try once more in a private window before reaching out.
Contact our support team with a screenshot of the error and the email on your Inrō account. It helps if you also tell us your browser and version, your device and operating system, whether the Facebook login method worked, and roughly when you last tried. For the full set of connection checks, see How to fix common Meta & Instagram connection errors.