Hi Azure,
You are stating that your pricing tier is set to S0 (Standard). However, the error message explicitly indicates that the F0 (Free) pricing tier is being used. Please check the Document Intelligence Studio to confirm which tier is currently active, as shown below.
To avoid encountering this issue in the future, please enable autoscaling, as shown below.
Thank you for reaching Microsoft QNA Portal.
Feel free to accept this as an answer.