Whether the notice needs to be stamped with the official seal, and whether it is valid without the official seal depends on the specific situation and legal provisions.

Generally speaking, the notice is an official document, and it usually needs to be stamped with the official seal to prove its authenticity. If the notice is not stamped with the official seal, it can be regarded as invalid or not recognized.

However, in some cases, the notice may not need to be stamped with the official seal. For example, if the notice is sent through electronic channels such as email or social media, it may not be possible to affix the official seal. In this case, if the content of the notice is clear, accurate and in line with the law, it can also be regarded as effective.

In addition, in some cases, the notice may not need to be stamped with the official seal, but other forms of supporting documents are needed. For example, if the notice is submitted to a government agency or a legal agency, other supporting documents may be needed to prove the authenticity of the notice.

To sum up, whether the notice needs to be stamped with the official seal and whether it is valid without the official seal depends on the specific situation and legal provisions. If you need more specific legal advice or help, it is recommended to consult a professional lawyer or legal institution.

Legal basis:

Article 32 of the Contract Law of People's Republic of China (PRC) stipulates: "If the parties conclude a contract in the form of a contract, the contract will be established when both parties sign or seal it."

Article 3 of People's Republic of China (PRC) Electronic Signature Law stipulates: "In civil activities, the parties may agree to use or not use electronic signatures and data messages. A document in the form of electronic signature or data message agreed by the parties shall not be denied its legal effect just because it is in the form of electronic signature or data message. "