I can't adjust volume on my Macbook pro

As showing on the picture above, I am not allowed to increase or decrease the volume of my external speaker. It just happened recently
Also when I go into perferences, under audio, it will say the chosen device has no output control.
I tried to search online for a solution, however, the solution that came up is through plugging a headphone and remove it.
I need to do it everytime after restarting my Mac from a shut down.
Please help!!!

Hello,
Make sure your MacBook's sound output is set to the correct setting. To do this go to 'System Prefrences' and open the 'Sound' page, select the correct output, 'Internal Speakers' are the deafult setting for MacBook's. Hopefully this should solve your problem.
Hope this helps!

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