Assign/remove current user to/from an absence region.

Assigns or removes the current user to/from an absence region. A user can be assigned to only one absence region. If a user is already assigned to an absence region, they will be removed from the previous one and assigned to the new one. Providing a null region id will remove the user from any absence region.

<Check title="Required Permissions" icon="key">The user must be an admin or have user-planning-data:write permissions.</Check>