At 2:00 PM PST Instagram released a fix which means you can now normally add your Instagram profile to Later. In case you added your Instagram creator/personal profile during this downtime, please refresh the Instagram connection from Later on desktop. Thank you for your patience while we worked with Instagram to resolve this.
We're investigating an issue with adding new Instagram profiles to Later. The moment we have more information we'll share an update. In the meantime please post natively through Instagram. Thank you for your patience, resolving this is our top priority.