Hi @Ferreira, Aline ,
Welcome to our forum.
In order to further confirm your issue, could other Inline suggestions display normally on your Outlook Insights(such as Plan your time away and others)? And could you track the open rate on your web mail?
If you also couldn't find other suggestions there, please refer to this article to check :Why don't I see any inline suggestions?
If you just couldn't find the "Tracking email open rate" options there, basaed on my research, Insights does not display read information about every email that you send, there are many circumstances., please kindly check if your message it's also your case : Exceptions to qualifying messages
If that's invalid and you actually couldn't track rate on your web mail, due to here we mainly focus on general issue on Outlook desktop client, the feature of insight may be more related to Microsoft 365 instead of Outlook, in order to resolve it better, it's suggested to post your issue on this dedicated microsoft 365 forum.
Hope your issue would be resolved soon.
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