This usually indicates a connectivity issue. SketchUp 2017 needs to communicate with auth.sketchup.com or app.sketchup.com .
There are two types of licenses available for SketchUp 2017: license sketchup 2017
To activate and manage your SketchUp 2017 license: This usually indicates a connectivity issue
SketchUp 2017 utilizes a Classic License model, which is distinct from the subscription-based model used by modern versions. Because SketchUp 2017 reached its "End of Support" on January 14, 2021, license management and technical support for this specific version are limited. SketchUp Community License Types for SketchUp 2017 SketchUp Make 2017 (Free): Because SketchUp 2017 reached its "End of Support"
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⚠️ : YouTube tutorials or forums offering free license keys for SketchUp 2017 are scams or distribution of cracked software. Downloading and using such tools puts your data and legal standing at risk.