LinkedIn seems puzzling. I am a member of a charity (non-profit) and want to start a LinkedIn group on their behalf. I also have a personal LinkedIn account. I don't want to mix the two.
The non-profit assigned me an email address. When I attempt to register with LinkedIn with that address, LinkedIn re-allocate my personal LinkedIn account to the password I give for that new address - i.e., refuses to accept that I can both have a personal account and a nonprofit account.