You give a user permissions to access a site or add him to a group that has access to the Sharepoint site. 
But when the user tries to log in, the user is presented with the "You do have have permission" page and a button to request access. 

When you delete a device in Intune first, it doesn't get deleted in Entra ID. In fact, it stays there as a Autopilot device and you can't delete it. 
This is because the device is still registered as an Autopilot enrolled device in Intune and you need to delete that.
However, the enrollment list only contains, a few columns like the serial number, brand and model and you can't search using the computer name. 

Microsoft 365 allows you to provide user within your organization custom made templates for Word, Excel and Powerpoint. 
This requires you to create or use and existing Sharepoint page and within that one or multiple document libraries need to be designated to store the templates. 

This can be useful if you want to give other departments the ability to manage it easily and not going through the hassle of applying the templates through scripting by copying the templates into a specific folder.

I use PowerBI primarly with CRM Dynamics 365. I just like the multitude of options it gives you in creating reports and graphs for users compared to the out of the box functionality in CRM Dynamics.
There's even a build in integration, so it's like Microsoft is practically begging me to use it.

I make a lot of reports that contain weeknumbers, like for example the amount of activities completed for each week. However PowerBI doesn't care where you are from, by default it applies the US definition of how weeknumbers are defined.
I'm from the EU, where ISO 8601 is being used and because of this alot of my users report that their activities are in the wrong week.