Activities do not appear in Account's activity log in SFDC, although they do appear in the contact's activity log

Symptom

Activities do not appear in Account's activity log in SFDC, although they do appear in the contact's activity log.

Applies To

• Sync of contact's activities to the associated account in SFDC

• SFDC configuration

Resolution

If contacts' activities sync to the corresponding contact in SFDC but not to the associated account, it could be due to the SFDC option 'Roll up activities to a contact's primary account' having been deactivated.
If that is the case, In order to have the activity associated with Account in Salesforce, the user's Salesforce admin needs to enable Activities rollup - Roll up activities to a contact's primary account.

• Enable Roll Up of Activities to a Contact’s Primary Account

Cause 

Activities rollup - Roll up activities to a contact's primary account was turned off in the user's SFDC.