clean up breadcrumbs after removal/disconnect of a work/school ms account

I have my former work laptop to keep and want to clean it up to remove everything. On their end, they did something to cancel (?) me from using Office 365 over a year ago. I haven't been using this laptop but may start using it now. Thanks to a Brink tutorial I finally found the option to DISCONNECT the work/school account. I wanted to see REMOVE or DELETE but DISCONNECT was the best I could find. I also uninstalled MS Office 365 and One Note. And I re-started the machine. However, searching through the registry I still find many instances of "myoldcompanyname.com". Too many to blindly replace without fear of screwing up something.

Oh I probably should have started at the beginning. When the laptop was first initiated ~3 years ago, I got suckered into using a MS account to activate but quickly turned it around and created a Local User account which I used the entire time. And of course I no longer have access to my email at that company.

Ideas where other work/school account info might be lurking? I've gone thru every scenario in the "how to remove" tutorials and nothing is left. I fear the breadcrumbs remain intentionally in case I want to "reconnect".

Here's a few of many:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\F33B08125223E324BB1C7789FC3DDCF1\InstallProperties
HKEY_USERS\S-1-5-21-3002940560-579305146-2163097860-1003\Software\Microsoft\Office\16.0\Common\Identity\DocToIdMapping\7dcee33c-e2c3-4de0-8794-d0ba36e8a05f_ADAL
some key: https://netorg2998806-my.sharepoint...964a4ca052ec1d78f46989')/activitycapabilities
HKEY_USERS\S-1-5-21-3002940560-579305146-2163097860-1003\Software\Microsoft\Office\16.0\Common\Identity\ServiceAuthInfoCache\CredStoreKeyToAuthScheme
some key: https://autodiscover.myoldcompanyname.com (40 hex)