There is an error in TRedisClientRedisSET in Quick.Data.Redis. Here is the fix code
function TRedisClient.RedisSET(const aKey, aValue: string): Boolean;
var
rediscmd : IRedisCommand;
begin
rediscmd := TRedisCommand.Create('SET')
.AddArgument(aKey)
.AddArgument(aValue);
Result := Command(rediscmd.ToCommand).IsDone;
end;