Connect an Azure Subscription for collecting activity logs in OMS

When trying to enable the Microsoft Operations Management Suite (OMS) solution Activity Log Analytics you might see this notice in the OMS portal for your workspace:

Performing Assessment
To use this solution, please connect an Azure Subscription for collecting activity logs. A subscription can be connected using the activity logs blade of a workspace in the Azure portal.

This messages is shown even if you just enabled the solution and OMS is getting things ready. But you might, like I, start doubting if the expected subscription is actually connected to the OMS workspace.

To check this you might need more guidance than provided above, so try the following:

1. Go to the Azure portal (https://portal.azure.com)
   
2. Select the Log Analytics service (in the left portal menu)
   
3. Click the relevant OMS workspace name in the list presented
   
4. Scroll down to select the Azure Activity log menu item beneath WORK SPACE DATA SOURCES
   
   
   
5. Finally you will be presented a list of subscriptions showing if the subscription is connected or not.
   
6. You can change the connected status by selecting clicking the subscription and then use the connect disconnect menu: