Trying to activate more than 1 certification

Hello,

I have an enter rule triggered on activation period of a certification, but some certifications take up to 30 minutes to activate and when i try to activate another one i get the following error:

An instance of task ‘Activate Certification Group’ is already running.

(This task was not configured in no time and I didn’t find where i can edit it)

Is there any possibility of activate 2 or more certifications at the same time ?