Trimble (SketchUp's parent company) abandoned traditional perpetual licenses and offline authorization codes several years before 2021. Starting with SketchUp Pro 2019, the software moved entirely to subscription-based licensing with online verification.
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If you are searching for a you are likely trying to activate a classic perpetual license of the software. However, publicly available lists of serial numbers and authorization codes do not work and pose severe security risks. Sketchup Pro 2021 Serial Number And Authorization Code List
Cracked software often contains malware that can steal your banking information or log your keystrokes. Sketchup Pro 2021 Serial Number And Authorization Code List