So… Great news!!!
After I use the command “sudo apt-get purge mosquitto”, I have re-installed Mosquitto, configured it and boom!!! it is working!!!
So the problem is on Hassbian or on “all in one installation” because after I removed Mosquitto and re-installed finally it is working!!!
Thank you all so much for your help! I will definitely start following this community every day!
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this did it for me if you installed via Hassbian. Thank you!
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