Hello again!
The product team got back to me with some information. First, they recommend reaching out to Sinch support for additional assistance. This resource will be able to use information specific to your account/solution to provide more individualized help.
They also recommend ensuring that you are attempting to connect a professional/business Instagram account. This prerequisite is called out in our article on connecting an Instagram account to a Conversation API app. Based on your original post, it sounds like you've already walked through this process, but you can review the article to see if there are any additional details that may apply to your situation.
If the team uncovers any additional information that is relevant to your issue, I'll be sure to let you know. Thank you again for reaching out, and please let us know if you have any other questions.
Thanks!
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