What should I do if the text message of the accident identification document handled by Beijing traffic police can't be opened?

In this case, you can directly call or specifically ask the local traffic police department.

Traffic accident responsibility confirmation is a document material formed when confirming whether the parties involved in traffic accidents have violated regulations and qualitatively and quantitatively judging the causal relationship between the violations and the damage consequences of traffic accidents. It is a technical document with legal effect, and its purpose is to distinguish the responsibility of the accident and make correct and appropriate punishment for the perpetrators according to traffic laws and regulations.

Legal basis: Article 62 of the Provisions on Procedures for Handling Road Traffic Accidents, the traffic administrative department of the public security organ shall make a road traffic accident determination within 10 days from the date of on-site investigation.