Tutorial-rag.ipynb fails

I already creared Index, Data Source, SkillSet and Indexer successfully following Tutorial-rag.ipynb. When I checked the indexer running status, I encountered below error: 

I am using User-assigned managed Identity to follow the guide. I can take for sure I already append the permissions.

Open Tutorial-rag.ipynb and reproduce the indexer status failure using a user-assigned managed identity. Review the notebook's Index, Data Source, SkillSet, and Indexer setup and compare it with the permissions already granted; the issue is resolved when the indexer runs successfully.

索引モデルが issue の本文から書いたものです。