OK I finally got through this. The error is emitted when the PR's ID number is in the SS format: [social security number removed]. T-Tax thinks that this is an ...
I think I may have done something similar. I signed and scanned 8453 form, but may have picked the wrong file to attach to T-Tax (attached the blank unsigned fo...
OK here is an addendum to my post. A bit of an explanation of why I am confused about this topic that should not be that difficult. Been looking around the web ...