You can provide your legal name in the W-8BEN tax form in your user settings, however I would suggest consulting with a legal adviser regarding your question about requesting a VAT number, as we wouldn't be able to advise on this.
@Dave M wrote:
1) In the template letter form you shared for requesting a VAT number, there is a bullet-point about making a European Service Declaration (ESD) is it relevant to autoentrepreneurs & if so how/when does one complete this formality?
Since Upwork won't give you the contact details of the client, good luck with this.
2) UpWork asks for a "Legal Name" in the W-8BEN section, but (as I understand it) an autoentrepreneur is an individual & does not have a company name, so presumably this should just be my own name?
The W-8BEN is for US tax compliance only. French law doesn't apply. Just put your name.
Not everyone is fluent in English. If you are giving data (complicated to understand) on a specific topic and for a specific country and language, you should allow the necessary language to be used. In this case the French.
I say this because of my experience.