Ok the GPU is visibile.
Can you double check the device placement with:

  
      

      TensorFlow
  

  
    

tf.debugging.set_log_device_placement  |  TensorFlow Core v2.6.0 9

  Turns logging for device placement decisions on or off.


  

  
    
    
  

  


Also It could be nice if you can check if you have the same issue with TF 2.6.0