Dimension code combination
The DimensionAttributeValueCombination table does exist in D365. However, not every table in the database has an entity associated with it. Depending on the bigger picture of what you're after, you may find what you need in another entity. If not, you can always create an entity that will extract that table and be available via data management in the same way. If you're not comfortable using Visual Studio or the D365 developer tools, you may need to involve IT to get this done.
Please let me know if I may provide additional information.
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