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Luison Lassala 13Luison Lassala 13 

Completed tasks under Activity History not displaying in Lightning

For some strange reason, I have an org in which the tasks and events which are 'Completed' do not show up under Activity History in LEX, but they do show up on Classic and SalesForce1 - can anyone explain to me why this is the case??
See the two screenshots from the same Contact record: one shows two completed Tasks (Classic), the other shows "No past activity." !!!??
The users of this org are starting to lose faith & trust in LEX and switching over to Classic!

User-added image

User-added image
SandhyaSandhya (Salesforce Developers) 
Hi,

From your screenshot, I see that this activity is one year old and from below link it says

Activities are archived regardless of whether you use Salesforce Classic, Lightning Experience, or Salesforce1. However, although you can view archived activities in exported data and in Salesforce Classic, you can’t view them in Lightning Experience or Salesforce1.

https://help.salesforce.com/articleView?id=activities_archived.htm&language=en&type=0
 
The idea has been posted regarding the same. Please refer below link.

https://success.salesforce.com/ideaView?id=08730000000LjHIAA0

 Hope this information helps you!

If this helps you, please mark it as solved so that it will be available for others as a proper solution.

Thanks and Regards
Sandhya