Hi @badflash and welcome to the forum.
What device are you running Node-red on?
Of course Node-red displays (8) black dots instead of the actual password, I've never seen asterisks, but that might depend on your browser.
You say you can go into the broker setup and update the info, but when you click Update and Done to close the broker dialog, does the red triangle over the node disappear?
Have you clicked Deploy to save your changes?
The server name is a long string of hexadecimal characters followed (in my experience) by .s1.eu.hivemq.cloud
