For 3ds Max, the Product Key changes .
You will notice that most keys from 2021 to 2026 are 128M1 . However, if you are installing a specialized suite (like the "Building Design Suite" or "Entertainment Creation Suite") from older years, the key might be different. 3ds max product key
Note: The key changed from 128L1 to 128M1 starting in 2021. For 3ds Max, the Product Key changes