Passwords on shared documents not working

On OneDrive, I choose Share

Add People

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Password added for EACH new file shared with a different person. I am NOT changing the password to the SAME file being shared with multiple people.

Password doesn't work for them. Why?

Why does it come up save password for each document I share? 

Is it changing the password for ALL files when I assign a new password to sperate documents for separate people?

Should I just use ONE standard password to each unique link?

Help!