Ton Proof signatures generated from websites opened via Ton Keeper don't get verified

[hwnprsd]

networks["-239"], _ = liteapi.NewClientWithDefaultMainnet()
tp := datatype.TonProof{
	Address: "0:05c1fbbc1a60df26e4998e7a7e4515d049960fe73ef6e213fa7be1a8effc2c18",
	Network: "-239",
	Proof: datatype.MessageInfo{
		Timestamp: int64(1728404674),
		Domain: datatype.Domain{
			Value:       "ordinox-staging.vercel.app",
			LengthBytes: uint32(len("ordinox-staging.vercel.app")),
		},
		Signature: "fhKEfE5viRjAU3q3/eKOdFu4M59RbOaOvysF71PKJ/dHLDVu+HD5WEXzycxw/n82a1pLbCtQouLIZzuLlaZ7AA==",
		Payload:   "{\"message\":\"You are logging into Origins by Ordinox. Nonce\",\"nonce\":\"1dd914cc2ebeeb80fe1ee1197c1981a4619665eb07b88d32ad9a865abf9366ed\",\"timestamp\":1728404668}",
		StateInit: "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",
	},
}

The signature is generated using the TonKeeper app, with the domain opened from it.
Why is this signature not being verified?