Read this order
Key → Mountain: An important solution that meets a barrier. Access may be limited, or the proposed answer may take longer to put into practice.
What changes in reverse?
Mountain → Key: A solution to a stubborn obstacle, or the specific access needed to get past it. Key offers an opening; it does not make the barrier disappear by itself.
Mountain → Key ↗A practical example
Imagine a form blocked by a missing document. Mountain + Key can describe finding the required document; Key + Mountain can fit an answer that remains hard to use. The obstacle and the opening both belong to the reading.
Check it against your question
Keep the actual order and ask which part of the example fits your situation. An example illustrates a possible reading; it does not establish facts or promise an outcome.
The meanings behind the pair
Key: Key represents a solution, access or an important answer. In a reading, it can point to the detail that helps you move forward.
Mountain: Mountain is a substantial obstacle, blockage or delay. It shows where movement is difficult; other cards may indicate whether a route around it is available.
These examples show possible ways to read the pair. Your question and the other cards may change the meaning.