There are steps that you need to check:
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Your Instagram account is still in a personal state. Please upgrade to a business account or creator you can follow these guides Create Instagram Business Account or Create Instagram Creator Account.
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Your Facebook Page is not connected with an Instagram Business/Creator. Please connect to your Facebook Page, you can follow this guide Connect Facebook Page with Instagram Business/Creator.
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Your Facebook Page access still reviewing or not confirmed. Please review/confirm via Facebook Page Settings or Instagram Apps - Edit Profile.
- Your Instagram's number of followers is less than 1k or over than 100k. There are schedule of the rollout for this here https://developers.facebook.com/docs/messenger-platform/instagram/rollout/
- You are not an admin role on your Facebook Page. Please make sure you are admin on your Facebook Page by following this doc.
- Try to reconnect between your Facebook Page and IG account, and also reconnect between your Qiscus Multichannel and your Facebook Page.
- Ensure to enable allow access to messages in your IG Business Account
