Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi @Junmo Yang
Based on your description, this issue may be related to a mismatch between your Microsoft 365 tenant region and your billing or payment information. Even if the tenant region is configured correctly, the purchase can still fail if the payment method was issued in a different country/region or is not supported. Additionally, using a personal Microsoft account while setting up a Microsoft 365 Business subscription can sometimes cause identity conflicts during the signup process.
Reference: Microsoft 365 system requirements
Since you're having trouble purchasing a Microsoft 365 Business Standard subscription, I recommend verifying that your billing address and payment method are all registered in the same country/region. You may also want to check with your bank to ensure that the card supports online and international transactions and that there are no spending restrictions or insufficient funds. If the issue persists, you could try completing the purchase using a different browser, an InPrivate/Incognito session, or a different device.
You could give it a try and let me know if this helps.
If you have any additional concerns, feel free to comment below. I would be more than happy to assist.