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Windows client name is derived from config file name when importing to WireGuard and it only accepts names satisfying /^[a-zA-Z0-9_=+.-]{1,32}$/.
For more information look at https://github.com/WireGuard/wireguard-windows/blob/af60ab229954519b8295bb3ef453231f4d3b9087/conf/name.go#L24.