Welcome to the Wefugees Community and thank you for reaching out to us.
The mentioned "employment visa" according to section 19d of the German Residence Act is not a "visa" or residence permit as such. It is actually the "Beschäftigungsduldung" your lawyer was recommending you to apply for. For the requirements and more details, please see Melina's answer in this thread.
I hope this helps and please don't hesitate to get back to us with any further questions.
All the best,