After upgrading to Tableau Server version 2025.3.0 or later, error when accessing workbooks connected to Published datasources.

The fix for both of these issues is to implement the following:

1. Verify whether the below flags are enabled by running:
   1. tsm configuration get -k features.SQLSubqueryCache
   2. tsm configuration get -k features.VizDataServiceClientEnable
   3. tsm configuration get -k features.VizDataServiceHTTPEndpointEnable
   4. tsm configuration get -k features.VizDataServiceBackgrounderEnable
2. If the feature flag is currently set to true, disable it by running:
   1. tsm configuration set -k features.SQLSubqueryCache -v false
   2. tsm configuration set -k features.VizDataServiceClientEnable -v false
   3. tsm configuration set -k features.VizDataServiceHTTPEndpointEnable -v false
   4. tsm configuration set -k features.VizDataServiceBackgrounderEnable -v false
   5. tsm pending-changes apply

Starting Tableau Server version 2025.3.4, the above flags are set to "false" by default and there is no need to manually set them to false.

The same can be checked using 'tsm configuration get -k" for any of the four flags mentioned above.

For customers using Tableau Server version 2025.3.4 or later, any changes to set the above flag values to true in version 2025.3.4 should be coordinated with Technical Support. If customers choose to enable these features by setting the flags to "true" on their own in 2025.3.4, it is strongly advised to thoroughly test the functionality first. If the features perform as expected, the flags can remain set to "true"; otherwise, it is recommended to revert them back to "false."

Please be aware that in Tableau Server version 2025.3.5, these flags default to "false," so it’s important to verify their settings again after upgrading to this version.