> a product by Dolphin software.
That will be Dolphin SuperNova
$1 or one of their related products. I know someone who uses this. I know that different web browsers work differently with it. You could try the main three (Edge, Chrome, Firefox) and see if one works better,
They have support where you can ask them questions like this. They can also use TeamViewer to provide remote support. They may be able to explain why the screenreader is not speaking the username field.
(EDIT: it looks like you have already contacted them)
Screenreaders may not read back passwords for the same reasons browsers replace passwords with * * * * etc. so that someone nearby can't eavesdrop.
SuperNova has a lot of functionality that may not be supported by alternatives that are just screenreaders. E.g. it offers screen magnification and colour changing that works for some visual impairments, and it supports conversion of PDF and other formats to Word including OCR. Yes it is very expensive but this is what complicated software costs when you are not selling millions of copies.