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You don’t actually need a special downgrade key. When you buy Windows Server 2025 Standard, the license includes rights to run earlier versions like 2022 Standard. The process is simply to install Windows Server 2022 Standard, then activate it with your 2025 Standard product key. If online activation fails, you’ll need to use the phone activation option and clearly tell the agent you’re exercising downgrade rights. Microsoft doesn’t issue separate keys for this; the same 2025 key is valid for 2022 under the license terms.