In my account all newly created batch-accounts/Pools now have a quota of 0 - probably that's why you got the message about the CPU core limit.
My existing batch-accounts/pools still have their original quotas - If you have a working batch-account it's probably a good idea to keep re-using that account for now.
I will contact the azure-support and check if they increase the quota on request.
Yes, you right.
I do some mistake by del all the resources group. If you just del the pool then create a new one then you should be ok.
For now all new active Azure account can not create batch job anymore, seem they found this ^^