Your status gives other Teams users an at-a-glance indication of whether you're available to chat, busy in a meeting, or just temporarily away for a few minutes.
You can see your current status represented by an icon next to your profile picture in the upper-right corner. By default, your status is listed as "Available." Teams will automatically change your status when you're idle, in a meeting, or on a call.
You can also set a custom status message to provide some extra information to your colleagues—for example, if you're working from home instead of the office.
Click your profile picture in the upper right.
Select Set status message.
Enter a message in the text field.
Click the Clear status message after list arrow.
Select when you want the status message to expire.
You can select one of the automatic options or select Custom and set another time. You can also select Never to keep your status until you clear it.
Click Done.
The custom status message is set.
To clear a custom status manually, click your profile picture in the upper right and click the Delete this status message button.