How to put Dynamics 365 in maintenance mode?

In AX 2012 in order to import a license file, just go to your license management form in system administration module and click on import, select the file and run a full sync.

in Dynamic 365, this form is read-only and you can not edit until you put your system in maintenance mode.

to apply the maintenance mode for sandbox

just log in to lcs with your admin account and select your project

https://lcs.dynamics.com/v2

select your environment and click full details

click maitain and enable maintenance mode

To enable maintenance mode in one box environment, you can check this links

https://community.dynamics.com/ax/b/ax2012codingaxclated/archive/2018/06/22/d365fo-maintenance-mode-importing-license-file-isv-var-add-on-license-import

http://axtechsolutions.blogspot.com/2018/06/change-maintenance-mode-for-license.html

Thanks.