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There could be several reasons for this, such as:

1. Incorrect installation: Angular might not have been installed properly or at all.

2. Incorrect import: Angular may not have been imported correctly within the React component.

3. Incorrect configuration: The Angular configuration file may not be set up correctly.

4. Name conflicts: There might be naming conflicts between React and Angular elements with the same name.

5. Compatibility issues: There could be compatibility issues between the two frameworks that are preventing communication.