If the client insists on a Grammarly score, and you know you cannot access it, they should be told this. There are other alternatives, and those have been discussed previously in the topics where the inaccessibility of Grammarly has been noted.
Please search the Chat and Main NVDA groups for additional details.
Brian - Windows 10, 64-Bit, Version 21H2, Build 19044
Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.
~ Martin Luther King, Jr.