Hello KashishCC,
Good day! Thank you for reaching out to Microsoft community.
As per your description, it seems like that you are facing an issue while entering the verification code during the Power BI account creation process. The system:
- Sends a verification code, but when you enter it, it says the code is incorrect.
- After multiple failed attempts (10-15 times), your phone number got blocked.
I am sorry to see that you are unable to create your Power BI account.
However, luckily there is another specific channel for your mentioned concern where you will get some possible information for certain specific resources and platform from our related community members.
I understand your concern but since your problem is related to Power BI, I would also like to suggest you post your concern in the related community i.e., Ask a question - Power BI - Microsoft Fabric Community Q&A to get the detailed help from the experts.

Apologies for redirecting you to different community as the members in the category posted focus on the users with out of the box concerns on Microsoft 365 and have limited knowledge on the Power BI; so, to get the fast and better assistance, we have redirected you in the correct path.
Appreciate your patience and understanding. Have a great day!!
Best Regards,
S M Nazmun Nur