'Post method does not send id

I have and issue that my post method is getting an id of null when i try and create a new post for my app. public void Add(Project project)

    {
        _tRDbContext.Projects.Add(project);
        var b = _tRDbContext.Projects.SingleOrDefault(p => p.ProjectId == project.ProjectId);
    }

i cant see to find the issue.

webapi

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