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There could be several reasons for the failure of connecting the MongoDB collection through the application, including:

1. Incorrect configuration of the database connection parameters such as the host name, port number, and authentication credentials.

2. Firewall or network issues that prevent the application from accessing the database server.

3. The database server itself could be down or experiencing connectivity issues.

4. The application code could contain errors or bugs that prevent it from connecting to the database correctly.

5. Incompatibility issues between the application and the MongoDB version or driver used.

6. Insufficient privileges or permissions for the application user to access the MongoDB collection.

7. Resource constraints such as low memory or CPU usage that prevent the application from establishing a connection with the database.

To resolve these issues, the developer should carefully review the application code and the database configuration parameters to ensure they are correct. They should also check the status of the database server and network connectivity. Additionally, they can seek help from the MongoDB community or support team to troubleshoot and resolve the issue.