SharePoint mounting problem


I have the professional subscription with SharePoint option.
Yet, the OK button in add drive / business / sharepoint is greyed out.
What is missing?

BTW The support / documents / sharepoint seems to be outdated with
storage / Microsoft / sharepoint not matching actual menu structure.

Hi~ @Bardo_Mueller,

You have to (re)load button.

Also, sorry for the out-of-dated document. It will be refreshed soon.