<Correction>
in order to 'move the pin on the google map', I actually clicked on the map (in Chromium Edge, on Windows 10) , which opened it up bigger. then with my mouse I could grab that pin and move it to where I wanted it to be.
The "Home Location" field might just be simply text, which isn't tied to the map?
I could save the changed text in the "Home Location" when using Firefox browser on Windows 10. and "sometimes" I could do so when using Chromium Edge. Sometimes it threw that error, and sometimes it said it saved the changes.