To apply multiple lock screen photos as a slideshow through Group Policy to all computers joined to a domain, you can use the Group Policy setting "Force a specific default lock screen and logon image." Here's how you can set it up:
Create a Folder for Lock Screen Photos:
First, you'll need to organize the images you want to use in a folder on a network share that is accessible to all the domain-joined computers.
Group Policy Management:
On a computer with the Group Policy Management Console (GPMC) installed, open the Group Policy Management Console by running gpmc.msc.
Create a GPO:
Create a new Group Policy Object (GPO) for the lock screen settings. Right-click on your domain or an Organizational Unit (OU) where you want to apply the policy, then select "Create a GPO in this domain, and Link it here." Give it a name, like "Lock Screen Slideshow."
Edit the GPO:
Right-click the newly created GPO and select "Edit."
Navigate to User Configuration:
Go to User Configuration > Administrative Templates > Control Panel > Personalization.
Enable the "Force a specific default lock screen and logon image" setting:
Double-click on "Force a specific default lock screen and logon image" to open its settings.
Configure the Setting:
In the settings, select "Enabled" and enter the file path to the folder containing your lock screen images on the network share. For example, if your images are in \server\share\lockscreen, you would enter that path. You can specify multiple images separated by semicolons.
Save and Exit:
Click "OK" to save the settings, then close the Group Policy Management Editor.
Link the GPO:
Go back to the Group Policy Management Console, right-click on the domain or OU, and choose "Edit." Link the "Lock Screen Slideshow" GPO that you created.
To ensure the policy is applied to the computers, you can run gpupdate /force on the client computers or wait for the regular group policy update cycle.
Log in to a client computer to verify that the lock screen slideshow is working. The images specified in the network share should be displayed as a slideshow.
Keep in mind that this policy will apply to all user accounts on the domain-joined computers. If you want different lock screen images for different groups of users or computers, you'll need to create separate GPOs or use security filtering to target specific users or computers.