Now I Fix It!
I Add
IDictionary<string, object> requestMessageParams = new Dictionary<string, object>();
requestMessageParams.Add("address", address);
requestMessageParams.Add("chain", Web3GL.ChainId());
requestMessageParams.Add("network", "evm");
Dictionary<string, object> authMessage = await Moralis.Cloud.RunAsync<Dictionary<string, object>>("requestMessage", requestMessageParams);
signMessage = authMessage["message"].ToString();
Above line 267 // Try to sign and catch the Exception when a user cancels the request too
Perhaps you @alex mean meant it, but I was not attentive. At First I add this only in one place - here