Define AlternateKey in ASP.Net Core Entity Framework

i define builder.HasAlternateKey(p => p.EnrollmentId);

record inset succesfully but while updating value not update in asp.net core 6

public async Task<Response<string>> UpdateClinic(Domain.Clinic.Clinic clinicRequest)
{
    
    var model = await _context.Clinic.AsNoTracking().FirstOrDefaultAsync(u => u.Id == clinicRequest.Id);
    if (model == null)
    {
        return new Response<string>(400, "BadRequest");
    }
 
    Clinic sc = _mapper.Map<Clinic>(clinicRequest);
    _context.Clinic.Update(sc);
    await _context.SaveChangesAsync();
    return new Response<string>(204, "Updated");
}