Hello @Goncalo,
Since you have only 4 cores , if you want to complete your lab - please follow below steps:
-> While creating the nodepool try to use a VM size which takes only 2 cores (ds2v2, ds2v3 etc) and choose only 1 or 2 nodes.
(Step2->Nodepools-> click on choose size -> select any of ds2v2 or ds2v3 -> Choose scale method manual -> Choose Min node count as 1)
-> If you are still facing the issue , the only option would be to submit the quota increase request
Regards,
Shiva.