Maintenance mode - Finance & Operations | Dynamics 365
https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/sysadmin/maintenance-mode
Aug 05, 2021 . Go to the environment details page and on the Maintain menu, click Enable Maintenance Mode. In the slider, set Turn maintenance mode on for the environment and select Confirm. A servicing operation will begin and your system will go into maintenance mode. On completion, the environment state will be In Maintenance. At this point, only the system …
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