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There can be several reasons why Hangfire is not recognizing the database context. Here are some possible solutions that you can try:

1. Make sure that the database context is registered in the Dependency Injection container. Hangfire uses the container to resolve dependencies, and if the context is not registered, it won't be able to find it.

2. Check if the database context has been created with the correct options. Hangfire requires that the context is created with the UseSqlServer method, which is part of the Microsoft.EntityFrameworkCore.SqlServer package.

3. Verify that the connection string is correct. Hangfire needs to connect to the same database that is used by the application, so make sure that the connection string used by Hangfire is the same as the one used by the application.

4. Ensure that the version of the Entity Framework used in the application is compatible with Hangfire. If the versions are not compatible, you may need to upgrade or downgrade one of them to ensure that they work together.

5. Check the startup configuration of Hangfire. Make sure that the configuration is done correctly and that the application is actually using Hangfire.

6. If none of the above solutions work, try restarting the application or server. Sometimes, this can clear up any issues causing Hangfire not to recognize the database context.