When in Admin Mode, navigate to More in the left menu and select Settings. Then go to System settings and select Single Sign-On. Click on Connect, sign in with your Microsoft account, and accept the permissions.
Once connected, users with the same domain will automatically join Pickit when they sign in with their Microsoft accounts. This also offers a seamless sign-in where the users only need to remember their Microsoft credentials to log in to Pickit.
Please note that you will have to be either the owner or have administrator rights to enable Single Sign-On.