FYI: I requested an increase of the quota for low-priority cores (20)  for one of my batch-accounts. It took some days, but then the quota was increased without any problem.
Requesting the quota-increase is very easy. If you go to your batch-account, there's the item "quotas" on the left pane. After clicking it it will show you your current quota-settings, and there is also a button "Request quota increase". You can just click it and fill the following form to get the increased quota (processing the request will likely take some time, though). For most cases 20 low-priority cores should be enough. I haven't tried it, but i guess if you are asking for a much higher quota azure might actually ask what you are planning to do...

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.

Yeah, the F-instances (which are E5-2673 v3) indeed work better than the FsV2-instances, at least for monero.

(That's not true for all algos, btw. Nimiq-mining for example has better performance with the FsV2-type).

So there was a bug in my autotune-feature for the thread-configuration. Apparently somehow this didn't have a noticeable effect with the pre-fork-algo, but since the fork the resulting hashrate is much worse.
So after fixing the bug the hashrate for 10 instances of F2 is back to around 1.4kH-1.6kH, and it does not seem to be dependent on the region so much anymore.

In order to activate the fix for your miners you can either restart your pool (scale to 0, then scale back to e.g. 10 instances) or you just wait for ca. 3 days (after running for 3 days the miners will fetch the latest version of the script from github).

Ok, the attack on supportXMR seems to be over. As far as i can see things work normally again.

Yes, that's a good idea. I'm putting this on my to-do-list...

what happens when there is no more monero to mine?

anyone know of a good, reputable source to get the MSDN accounts? All the peeps selling accounts on BCT seem like fraudsters...

Are you talking about actual MSDN-subscriptions with free monthly azure-credit, not just one-off Azure-accounts? May i ask you how you got the 3 subscriptions?

I'm glad to hear that it's working for you. Thanks for the suggestion about the workername. I'll write up the options for adding a workername in a later post.