Issues connecting Instagram to Manychat
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You need to either connect using that profile, or authorize the new user from the original profile.
If you lost access to the previous profile, you’ll need to contact support:
https://help.manychat.com/hc/en-us/articles/14281086345244-How-to-get-support-from-Manychat
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.