1. Copyright restriction: The copyright of the play may be restricted in some areas, which makes it impossible for the audience in that area to watch the play. This is usually due to the agreement between the copyright owner and the local media company. For example, some Japanese TV stations may restrict the online distribution of their programs to protect their ratings and advertising revenue.

2. Pay: If the play is paid, you need to buy a service or subscribe to a platform to watch it. If you don't pay or subscribe, you won't see the play.

3. Mistakes of streaming media service providers: Streaming media service providers may make mistakes, resulting in some users being unable to watch some programs. This may be caused by technical problems or server failures, and this situation usually only needs to wait for the service provider to fix it.