Ah, bummer. If it helps, you can try this to list out VM sizes with comparable capabilities and see if you have better luck with any others (--all not really necessary since it filters by NotAvailableForSubscription and similar):
az vm list-skus -l germanynorth -r virtualMachines --all > germanynorth.json
jq '.[] | select( any( .capabilities[]; (.name == "vCPUs" and (.value | tonumber) >= 4 )) and any(.capabilities[]; (.name == "MemoryGB" and ( .value | tonumber ) >= 32) ) )' germanynorth.json
Thanks a lot! Just checked internally. Apparently are there some instances which we could get but would not work cost wise (have for example a lot of CPUs but we mainly care about RAM). Additionally, is there also still a region-wide CPU limit that would still cause us problems. So sadly not a long-term solution. But thanks a lot!
looking at the time you seem to spend on this issue and the fact you're apparently only needing low double digits of those instances.
Are you really sure you shouldn't just buy a bunch of machines (500cores/2TiB go for ~60k€), throw them into a colo and then spend that time on actually doing stuff?