Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Microsoft's consumer support is done via chat, from Get Help app, https://support.microsoft.com/contactus.
If someone asks you to call, I wouldn't.
If you received a pop pup on your computer saying your computer is in some sort of trouble and you need to call Microsoft. DO NOT call. Instead, hold down Ctrl+Alt+Del, launch Task Manager and end all browser items to close that pop up. As long as you don't call and give them access to your computer, no damage done.