A. Verify that your Instagram account is set to a business or creator account, as personal accounts may have limitations with third-party posting tools. If you need to switch, go to your Instagram settings, select 'Account', and choose 'Switch to Professional Account'. Follow the prompts to complete the switch.
B. If your posts are still not visible, try manually posting the content at the scheduled time as a temporary workaround. You can set reminders for yourself to post manually until the issue is resolved.