Hello MyDesignShop,
Thank you for reaching out to our technical support forum. I’m sorry to hear about the trouble you’re experiencing. Rest assured, I will look into this issue for you and work to resolve it as quickly as possible.
But first, please follow the steps in the tutorial:
How to setup Instagram Gallery Addon
Make sure that you have checked the additional steps in the description too.
Also, check that if you have System - HTTP Header plugin enabled, then use this setting.
prnt.sc/kCMqiwIzK4mm
Best regards