Cannot connect to slushpool with bfgminer I am a complete newbie and just want to see how mining works in principle. No profit required. I have created an account on slushpool and have username and password. Then I go to my Ubuntu machine (a desktop, with GPU, no ASICs or something) and ran
bfgminer -o stratum+tcp://stratum.slushpool.com:3333 -u myusername -p mypassword

It started to print in cycles
 [2020-11-13 10:17:47] Waiting for devices; press 'M+' to add, or 'Q' to quit
 [2020-11-13 10:17:47] Probing for an alive pool
 [2020-11-13 10:17:48] pool 0 JSON stratum auth failed: [
   -1,
   &quot;Internal Server Error&quot;,
   null
]
 [2020-11-13 10:17:48] No servers were found that could be used to get work from.
 [2020-11-13 10:17:48] Please check the details from the list below of the servers you have input
 [2020-11-13 10:17:48] Most likely you have input the wrong URL, forgotten to add a port, or have not set up workers
 [2020-11-13 10:17:48] Pool: 0  URL: stratum+tcp://stratum.slushpool.com:3333  User: myusername Password: mypassword
 [2020-11-13 10:17:48] Press any key to exit, or BFGMiner will try again in 15s.
 [2020-11-13 10:18:04] No servers were found that could be used to get work from.
 [2020-11-13 10:18:04] Please check the details from the list below of the servers you have input
 [2020-11-13 10:18:04] Most likely you have input the wrong URL, forgotten to add a port, or have not set up workers
 [2020-11-13 10:18:04] Pool: 0  URL: stratum+tcp://stratum.slushpool.com:3333  User: myusername  Password: mypassword

Why? What is happening? What am I doing wrong?
I am also new to slushpool with bfgminer.
follow steps if it works to you .
sudo bfgminer

then enter url
stratum+tcp://stratum.slushpool.com:3333 

then it will ask username with worker
username.worker

then password
thats it .