Creative Cloud and Document Cloud service available across the geolocation, try purchasing the service using a different browser and check.
To check the details about the availability, please refer to Adobe article https://www.adobe.com/content/dam/acom/en/products/creativecloud/cc/pdfs/cc-availability-m atrix.pdf
If you still face any issue with the purchase, I will request you to contact the Adobe support team through Contact Customer Care
I have also shared the direct contact details by private message, please check your email inbox.
Feel free to update this discussion for any further assistance.