Carmel,
I am not able to sign into Collector. I think the following is actually a Google error message, but a follow-up email was sent to me from ESRI detailing the why's and wherefores of the issue.
403. That's an error.
Error: disallowed_useragent
This user-agent is not permitted to make an OAuth authorization request to Google as it is classified as an embedded user-agent (also known as a web-view). Per our policy, only browsers are permitted to make authorization requests to Google. We offer several libraries and samples for native apps to perform authorization requests in the browser.
I have a Personal, (Level 2?) License. Android OS