What if the Ontario graduate nomination is not signed?

Extend the application for work permit and seek legal advice.

1. The nomination of Ontario has been approved, but the work visa has not yet come down. You can consider extending your work visa application. You can submit an application for extension of work permit to IRCC, and provide relevant documents and supporting materials to explain the situation and request an extension.

2. If you encounter problems in applying for a work permit, you can consult a professional immigration lawyer or consultant, who can help you assess the situation and provide appropriate suggestions and solutions.