Accessing my HotSpot account from web

The problem still exists in 2021. Well, T-Mobile is still a young company and once they are 100 years old, they may have solved this problem. 

Meanwhile - I stuck the SIM card from my hotspot into a phone, had the system resend the code and it arrived within seconds. Then it asked me to verify my PIN and I vaguely remembered that I set it in the store. I always use 8888 (nah - just joking) and the system forced me to do 6 numbers, so I did 888888. 

By the way, the SIM doesn't allow for texting and I could neither send nor receive a text. It's pure luck that the text from the T-Mobile server came through.