How Can I Setup My T-Mobile ID for My Home Internet Account...???

I have a similar problem. I have a legacy Pay As You Go account which I use for 2FA only. I've had the account for years.  Once a year I purchase a phone minutes card and load it with whatever amount required to maintain 100 minutes.  Last week I purchased the T-Mobile 5G Home Internet which is working just fine.  My issue is establishing a second account for this product.  I have all the required numbers, account, PIN, subscriber and phone. Every time I try the setup a new ID their system responds with, I already have an ID. Their system is trying to place this product into an account that has a different account number.

I was fortunate enough to speak with a tech rep at the who toke the time to duplicate what I experienced and confirmed after hours of trying that the issue requires an engineering solution.  She created a ticket # 58752623, documented the issue and submitted to the engineering support group; that was three business days ago.  She did say it would take 3 to 5 business days to resolve and she would get back to me.

Yesterday I received my first bill by gateway tower message, no email; that was a surprise along with an included a $1.16 fee on my billed amount.  I'll wait the 2 more business days for them to resolve my account ID issue; if they don't, I'll request an RMA for the hardware and end this.