Prepaid Hotspot Data Plan - Can't Change Account PW

I have a Prepaid Hotspot Data plan in my RV Router with a Sim card and a phone number attached to it.  My cell service is with another carrier.  I recently tried to go into my account at Att.com/myprepaid.  I had trouble with my PW so I requested another one.  The page said they would text me a temp PW and also send it to my email.  I got the email stating they had texted me the new PW but did not have the PW displayed. I assumed they would use my current phone number to text me.  Waited an hour, no text, so I called Support.  Found out the text, with the new PW, goes to your Data Hotspot number.  The router has no display or attached cell phone.  Agent said I would have to go get the Sim out of my Hotspot and put it in another "device" to read the text to get the new PW.  Or I could go to the ATT Store and they "might" be able to help me.  He said they used to display PW in email but policy recently changed for security purposes.  He has gotten several of these types of calls and understands it is a real problem for Hotspot Data Plan users but there is nothing he could do.  So, I am locked out of my account and there's no easy way to get back in.

Anyone else had this experience?  What was your solution?