If you are a regular user of Chrome on Windows like me and have the auto-fill password manager enabled, you may be getting the Windows sign in prompt every time that you try to auto-fill any forms.
Looks like it is the “Use Windows Hello” setting in the Google Password manager (accessed from Settings -> Autofill and passwords -> Google Password Manager) which was causing this. Turned it off and no more prompts. You would want to leave it on if you are sharing the Windows account with others of course.
Thanks to this forum post.
