If you arrive here after December 4, 2024 by searching the error - unsupported request - method type: get like I did, it is because Facebook shut down the Instagram Basic Display API product. It was deprecated on September 4, 2024 and 90 days later, made unavailable.

I completed business verification and was approved, but this did not fix the error. It might be needed in addition to the following changes, but since I verified first, I can't say for sure.

With the error unresolved, I found a newer question on S/O with some helpful info: What is the alternative for instagram basic display api since its deprecated?

Facebook/Meta blog: Update on Instagram Basic Display API

Ultimately I had to create a new app, re-add and authorize users, generate and use new tokens. Generally I followed this guide: API setup with Instagram login. It wasn't too bad but my usage was simple, displaying a feed of the pictures from an account.