Problems updating a shared calendar invite

Good Morning,

We use the shared calendar feature in the company.
One person creates a meeting event and adds multiple participants. I need to add new participants.
When I add new participants, when I click on the "send update" button it doesn't show the message below:

"Made changes to the participant list. Choose one of the following options:
( ) Send updates only to additional or deleted participants
( ) Send updates to all participants"

Instead, it shows the following message:

"This meeting is not on your main calendar. Participant responses will not be displayed in the meeting, but you can still receive responses in email.
Do you want to send anyway?"

How should I configure outlook to show the first option?