Hi Gerjan Jonkers,
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.
Ask: Location 'West US 3' is not accepting creation of new Windows Azure SQL Database servers at this time
Solution: Ok. After posting my question I tried westus one more time, just because I could. I have tried this on Friday and today a couple of times. But now it works.So westus is a location is accepting creation of new Windows Azure SQL Database servers at this time.
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information.
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.
Please don’t forget to Accept Answer
and Yes
for "was this answer helpful" wherever the information provided helps you, this can be beneficial to other community members.