1. The articles of association of a listed company shall be publicized, and its major issues shall be approved by the board of directors, shareholders' meeting and relevant media. In violation of the procedures and rights of the articles of association, the guarantee is invalid; Review these regulations and procedures to ensure that they will be effective. 2. For a limited liability company, it should be analyzed in detail. The articles of association of a limited company do not have the effect of publicity, so it is impossible to publicize all the business of the company to the public, and there is no such place or media to provide publicity or access. Therefore, if a limited company violates its articles of association, it will be deemed effective as long as it is stamped with the official seal or signed by the person in charge. Unless it can be proved that someone has stolen the company name or official seal and provided false guarantee. But the burden of proof must be borne by the guarantor.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.