Before making any changes, test your connection on another device (e.g., a smartphone). If the other device connects successfully with the same credentials, the problem is 100% client-side – and the registry fix (Method 2) is almost guaranteed to resolve it.
If you get this error while connecting to a work/school Wi-Fi:
Older Windows versions (7, 8, 10) sometimes retain corrupted IPsec policies in the registry. Even after correcting the PSK, the system continues using the old, invalid key due to a caching bug.
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