The most common reason is that your Instagram account is not a business account. Note that it needs to be set to a business account for the API to work. To change your Instagram account to a business account, check out the article below.

Set Up a Business Account on Instagram

Note that Professional - Creator accounts will also not work as Instagram APIs are only available for Business Accounts.

For more information on how to setup your Instagram Integration, check out the article below:

How does Instagram sharing work?
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