Hello unfortunately I am unaware of the software version. Every time I try to log in I get a small window that appears to be running internet explorer, and I get an error saying the browser may not be secure. I was able to copy the link and copy paste it into chrom to get an Oauth key but was unable to find a way to enter it. Is this a known issue with any work arounds?
@JoMueller - there are a few Technical Support documents that may assist you with this error message.
Bug: Unable to Sign in to ArcGIS Online from ArcGIS pro Using Google Credentials (esri.com)
Problem: Unable to Sign in to ArcGIS pro with Google Credentials (esri.com)