Hello @Dietmar Moeller ,
I have reviewed your response above and understand only the particular subscription is not allowing you to create a VM with B2-Series SKU in Germany West Central region with the below or
Error :
This size is currently not available in "germanywestcentral" for this subscription
Available: NotAvailableForSubscription.
I can confirm that Bs-Series is available in Germany West Central as you can see in the below screenshot
Reference " services
The best way to check if the quota reflects for this SKU under azure portal->Subscription blade-> Usage + Quota- Microsoft.compute
Incase there is no quota for the specific SKU in the desire location, please raise a request from the same blade to increase the quota. These capacity requests are handled by subscriptions and quota management team through support cases. If you don't have the ability to open a support ticket, you can send an email with your SubscriptionID and link to this thread to AzCommunity@microsoft.com with subject line as "ATTN: Priyanka". I can then enable your subscription for one time free support.
Please "Accept as Answer" and Upvote if this response helped. This would inturn help others in the community looking for remediation for similar issues.