If these steps don’t work for you or you are unable to perform these steps, you may want to speak with your systems administrator to see if it can be enabled on the back end.
Basically your outlook needs to be synchronized with teams/ Skype, Thats when Display online status next to name will be available.
“Use Cached Exchange Mode” is likely disabled because of a Group Policy that is in effect on your computer. There is no workaround for this without removing Terminal Services from the machine.” The option is also grayed out if you are using Windows Server with Terminal Services installed. Cached Exchange Mode will be grayed out if you only have POP3 or IMAP accounts in Outlook. Note: This option is only available for accounts that are using Microsoft Exchange.