Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
As per checking, you can’t manually switch which currency is used in your Microsoft account balance. Even though your region is set to the US, the system will always deduct from the non‑empty balance tied to the original currency first. That means your 10 NTD will be consumed before your 10 USD balance is touched. Changing the region doesn’t convert existing funds, and balances in different currencies remain separate. The only way to spend in USD is to use up or clear the NTD balance, or start fresh with a new account set to the US region.