Hi there! This was published as a known issue first in 9.0.2: https://docs.splunk.com/Documentation/Splunk/9.0.2/ReleaseNotes/KnownIssues See the entry for SPL-235416. The preview UI in Ingest Actions has since been fixed in: Splunk Enterprise version 9.0.5+ Splunk Cloud Platform version 9.0.2303+   ... View more

Note that this feature is currently available for Splunk Cloud customers only. Check out this doc for a high level overview of the feature: https://docs.splunk.com/Documentation/SplunkCloud/latest/Data/DataIngest#Use_KMS_encryption_.28Splunk_Cloud_Platform_only.29 In conjunction with the “Create New Destination” Wizard in the Ingest Actions UI, you should navigate into your AWS console, and do the following:   Log into your AWS account Navigate to IAM > Roles Click Create Role Click Another AWS Account In the Role Name field, type exactly the name of SplunkIngestActions and click Create role. Click SplunkIngestActions. Under the Permissions tab, click Add inline policy. { "Version": "2023-01-01", "Statement": [ { "Effect": "Allow", "Action": [ "kms:GenerateDataKey*", "kms:DescribeKey" ], "Resource": "arn:aws:kms:us-east-1:<AWS_ACCOUNT_ID>:key/cff1c23d-4567-898f-7d6a-543eb2123456" } ] } { "Version": "2023-01-01", "Statement": [ { "Effect": "Allow", "Action": [ "s3:PutObject", "s3:ListBucket" ], "Resource": [ "arn:aws:s3:::buttercupgames-xyzyxs9t4r8w-ia-data-lake", "arn:aws:s3:::buttercupgames-xyzyxs9t4r8w-ia-data-lake/*" ] } ] } Click the JSON tab Overwrite the JSON text by copying and pasting the Permission Policy from the Splunk Ingest Actions UI (this is visible in the 2nd part of the Ingest Actions “Create New Destinations” wizard after selecting “KMS encryption”). See an example Permission Policy below.  Click Review Policy.  In the Name field, type any name of your choice, such as SplunkIngestActions.  Click Create policy.  Under the Trust relationships tab, click Edit trust relationship. { "Version": "2023-01-01", "Statement": [ { "Effect": "Allow", "Principal": { "AWS": "arn:aws:iam::<AWS_ACCOUNT_ID>:role/buttercupgames" }, "Action": "sts:AssumeRole" "Condition": { "StringEquals": { "sts:ExternalId": "08a3bc0d88e84fg3h909627i3jklmno0" } } } ] } } Overwrite the JSON text by copying and pasting the Trust Relationship from the Splunk Ingest Actions UI. See Example Below.  Click Update Trust Policy.   Note:  These steps reflect the Ingest Actions UI and AWS console at the time of this writing. Both interfaces may change over time. This bug currently exists but is fixed in the next available cloud release: https://docs.splunk.com/Documentation/SplunkCloud/9.0.2305/ReleaseNotes/Issues#Version_9.0.2305 ... View more