The limitation of creating a VM can be other than just regions. It Can be related to quota and a combination of (1) Service requested, (2) Type of subscription, (3) Regions.
For example, most free subscriptions like Sponsors and MSDN subscription probably cannot create a service of Virtual Machine Gen 2, type NC-series, in all regions
In some cases, the same subscription might be able to create a service of Virtual Machine Gen 1, type NC-series, in a specific regions.
Check the error details if you get such
In order to know what is the issue, we will need to get the exact error message which you get (or screenshot + message if you use the portal).
If the issue is related to "Insufficient quota", which is probably what you have, since this is the most common (therefore, without more information it will be my first guess), then you can send a request to get more quota (which does not mean anyone will approve it if this is a free account).
As mentioned, quota are related to the combination of (1) Service requested, (2) Type of subscription, (3) Regions. quota issues are mainly related to free account, but I think it can also be in Pay-As-You-Go simple subscription. I assume that in this case your request will be approved.
For example, in one of my free sponsor subscription, if I select Window 10 Gen 2 then I see no VM which fit my quota. If check one of the available VM, then I get the message:
4 vCPUs are needed for this configuration, but only 0 vCPUs (of 0) remain for the Standard NCASv3_T4 Family vCPUs.
This subscription (as you can see in the message) does not have any quota to use this type of service using this type of VM - it makes sense to limit free account for most people, since this is an expensive and unique by using specific hardware. The short description of NC-series is:
NC-series VMs are powered by the NVIDIA Tesla K80 card and the Intel Xeon E5-2690 v3 (Haswell) processor.
First, try to use a different template of VM - use Gen 1 for example instead of Gen 2 might solve your needs.
If this still not working then, Provide more information: (1) elaborate a bit more on the steps you do and the result including errors which you get, (2) provide the type of the subscription you use, (3) Elaborate what template of VM did you tried to use? (4) Confirm the issue is not related to "Insufficient quota" and if it is, then try to request for more quota.
Use the following document to check quota and get a bit more info:
If you are using the portal to request for more quota, then you will get the following message...
It can several seconds before you get refused:
And as I suggested above , the message will ask you to:
Submit a support ticket so that a support engineer can assist you in increasing your quota for your Standard NCASv3_T4 Family vCPUs in <name of the region you try to use come here> for <Name of the subscription type will come here>.