lastranget commented on issue #2207:
URL: https://github.com/apache/polaris/issues/2207#issuecomment-3136729794

   I received the same error having built my docker container with the latest 
main branch:
   
   `org.apache.iceberg.exceptions.RESTException: Unable to process: Failed to 
get subscoped credentials: (Service: Sts, Status Code: 400, Request ID: null) 
(SDK Attempt Count: 1)`
   
   FYI, I reached out to some people in my organization, and they're not under 
the impression that our instance of Pure FlashBlade S3 storage supports STS, so 
that could also be what's causing this. However, we were able to get 
vended-credentials to work with apache gravitino, so I'm curious if STS is 
actually a requirement for polaris custom s3 endpoints, and if so, why? 
Regardless, even if this is stemming from my s3 not supporting sts, I do still 
think there's an opportunity to have this error message be more fully formed, 
as other instances of this "subscoped credentials" error continue after the 
colon with a further reason.
   
   I'll try changing the storageConfigInfo to what you suggested and see if 
that changes anything.


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