Recover Locked Instagram Business Account

My team and I can no longer access our Instagram business profile. Even though we still control both the linked email address and phone number, every password-reset attempt ends with the same prompt: “Log in from a device you’ve used before.” We have tried from every phone, tablet, and desktop that has ever posted to the account, yet Instagram refuses to recognize any of them.

Here’s what we do have:
• Full access to the associated Facebook Page and to Meta Business Suite.
• Control of the account’s recovery email and phone number.
• Recent reset codes that reach us without issue.

Here’s what we have already attempted—unsuccessfully:
– Standard password resets on iOS, Android, and desktop.
– Trying to add the Instagram profile back through Business Suite and Facebook Page settings (unsuccessfully; it doesn't show and takes us back to login).
– Enabling Google-linked login.
– Repeating the login flow from all historic devices and IP addresses.

I need a specialist who has successfully navigated this exact “device used before” loop to step in, restore access, and hand the profile back to us in a secure state. A concise rundown of the steps you’ll take, any forms you’ll submit on our behalf, and the estimated timeline will help me choose quickly.

Deliverables
1. Restored login to the Instagram business account.
2. Verification that the account is re-connected to our Facebook Page and Business Suite.
3. A brief post-recovery guide so we can prevent this lock-out from happening again.

If you’ve cracked this wall before, I’m ready to start immediately.