What are the errors that invalidate a Sharia marriage contract, and does the lack of direct verbal communication between the girl's guardian and the man, relying solely on civil documentation, invalidate the contract?

Marriage has essential conditions and pillars for its completion, the most important of which are offer and acceptance, the guardian (wali), and witnesses. If any of these are absent, the marriage is invalid. What was mentioned about the lack of direct verbal communication between the girl's guardian and the man, and contenting oneself with civil documentation, if it means the absence of offer and acceptance between the guardian or his representative and the husband or his agent, then it is not considered a valid Islamic marriage.