Start > OneDrive

Follow prompts

Be sure to use [email protected] format when prompted for email

Start > Microsoft Teams

Follow prompts

Be sure to use [email protected] format when prompted for email

Start > Settings (gear icon)
Apps > Default apps
Email: Outlook
Music Player: VLC media player
Video Player: VLC media player
Web Browser: user choice (Google Chrome / Firefox / Microsoft Edge)

Still under Default apps

Click "Set defaults by app" (link down under reset button)
Click Adobe Acrobat Reader DC
Manage
Next to .pdf: Adobe Acrobat Reader DC