Dynamodb resource-based policy principal error

Question

I encountered an error when adding a resource-based policy for a DynamoDB table at the principal property. Although I entered the correct syntax, after some research, I found that changing the value from arn:aws:sts::{Account}:assumed-role/{RoleName}/{RoleSessionName} to arn:aws:iam::{Account}:assumed-role/{RoleName}/{RoleSessionName} resolved the issue. However, this change resulted in an incorrect syntax, and upon checking after updating the resource-based policy, the value had automatically reverted to arn:aws:sts by the AWS API. This behavior may be considered a bug.

Not work: Enter image description here

Work (but it's incorrect syntax): Enter image description here

After save the result with arn:aws:iam, the value had automatically reverted to arn:aws:sts: Enter image description here

Not work:
![Enter image description here](/media/postImages/original/IM6Anf2wQVTvmmpqDWm_VKpQ)

Work (but it's incorrect syntax):
![Enter image description here](/media/postImages/original/IMqtJn_IaiQp299g6Xx-3heQ)

After save the result with `arn:aws:iam`, the value had automatically reverted to `arn:aws:sts`:
![Enter image description here](/media/postImages/original/IMUtB2Xw5oQNWHPlyMXKT2dQ)

Answer

Hi,

Yes, such can be considered as a bug: to confirm that it is considered as one by the service team, you should open a ticket via the AWS service console. AWS Support will respond to it and let you know if / how it will be fixed.

AWS Service teams are not supposed to monitor re:Post as a community site.

Best,

Didier

Dynamodb resource-based policy principal error

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