Thanks @Varun CT and please make sure you meet the following conditions:
- You have the role of tenant administrator.
- Your account has been assigned a subscription.
- Switch to other countries or regions.
- In addition, Azure AD B2C team has started imposing limits on how many tenants can be created in subscription. Currently the limit is 20 B2C tenants per subscription.
Can you try using a different subscription or deleting some tenants from the subscription to bring the number down below 20 to see if that works for you.