What did I sign up for with my trial? I am finding unknow Bing access in my Microsoft History
Hello. You could be seeing what is termed "browser hijacking". The Microsoft forums have a suggestion for what to do here:
https://answers.microsoft.com/en-us/bing/forum/all/bing-search-history-not-mine/5caca020-3506-48b7-ab9a-4ca313fdc955
I would suggest downloading and running a full scan with Malwarebytes to find things Norton doesn't focus on. Norton primarily is focused on protection of the OS.
For Windows: https://www.malwarebytes.com/
SA