Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello, good day and thanks for your question. I understand that you are looking into changing to another and you will subscribe to Microsoft 365.
In this scenario, it is best to update your information first via https://go.microsoft.com/fwlink/?linkid=2195908 and this also includes changing the country and then add the card that you will be using via https://account.microsoft.com/billing/payments. If you still have an existing subscription, you will need to cancel it first before subscribing again and then you can go to https://account.microsoft.com/services/microsoft365/billing and try it from there or try to turn off the recurring billing at https://go.microsoft.com/fwlink/?linkid=2277073 and you can also follow the guided steps indicated from the link below.
If you will still encounter an issue, try this on an alternative browser and also by using inPrivate or Incognito browsing mode and the last option is that you can reach out to the support team at https://support.microsoft.com/en-us/contactus/ and then click on Microsoft 365 and then click Get Home Support and then type in Billing question and click the blue button that says Sign in to contact Support and login and proceed from there.