PC to MAC: The password you have is invalid, please try again.

[TaxExempt]

Hi all.

I have a Mac-Mini on my network which I control using Teamviewer from my Windows 10 computer.

Recently I have been getting this error message when trying to connect: "The password you have is invalid, please try again."
This should not be happening since nothing has changed and I have been using it on a regular basis for over a year. I manually went into my Mac-Mini using a monitor, keyboard, and mouse and forced in a new password, and I am still getting this password error message.

Has anybody else had this problem?