@michmoor on your redirect URL do you have https:// in front of the URL? I had mtalk.google.com redirect to google.com without the https, and it would show on the browser to many redirects, I changed it to https://www.google.com the error stopped and it worked without the error on the browser.
Keep in mind mtalk.google.com is used for Android push notifications, so my smart phones have approved access, but my desktops are not smartphone capable so it is disabled. Some devices like my iMac constantly had a connection to mtalk. I did some research and mtalk is also abused it seems by invasive actors. So my network now only lets the phones use it. I have googles assistant disabled on everything.