Hi,
Thanks for reaching out to Microsoft Q&A.
If you say you cannot subscribe, do you face any error message? what message are you getting when you try to create?
Also, can you make sure the email ID and the credit card you are using are not utilized before for creating any free account in microsoft?
Please Upvote and Accept as answer if the reply was helpful, this will be benefitting the other community members who go through the same issue.