Using Rule Tester to view Join Rule Values

From the top right of the screen, click the Search Time Traveler [V] button to locate the object joins you wish to inspect.

At this point presumably not all joins are performing as expected, so you might choose to search Time Traveler for a common key, such as Employee ID.

Once you have located your silo object, it may be showing in a join with at least a subset of other silos.  If this is the case, be sure to click on the link in the silo header corresponding to the silo for the first Join Values you wish to identify, e.g. Hyperverse. This will cause the Time Traveler to re-order the displayed silos, ensuring the selected one is the first column displayed.

Copy the object (GUID) from the URL immediately following the "/object/" text.  This corresponds to the Id for the desired silo object (first column), for example:
9986f93d-40aa-4bc8-909c-f27b46de8f42

Repeat this process for all silos to collect a complete set of GUIDs of the objects that you expect to be joining.

Under Query Filters, click +New.

For the Field Path, enter Id

For the comparison operator, select In

For the value, enter the following expression:

List(CoerceGuid("9986f93d-40aa-4bc8-909c-f27b46de8f42"), CoerceGuid("0f7dad41-6dfa-41a5-a263-610e902388b3"))

... replacing the GUID strings above in red with the Object Record Id values identified in the preceding steps.

Click Render to view the results.

If the Data Type, Key Name and Value all match (noting that matches must be case sensitive), then the silos can be expected to join.

For optimal performance, the primary join values should have the highest precedence in each environment.