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Try using Attach--attach to Roof. ( not sure how your model is built.) From Revit Help:
When attaching the top or base of a slanted wall to a roof, ceiling, or floor, the target element must cover the slanted wall entirely as viewed from above.
As a quick test, try making the angle element (slanted wall?) on the right side a Roof. Then attach the slanted wall on the left to it.
Or perhaps the opposite.
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