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Microsoft 365 und Office | Abonnement, Konto, Abrechnung | Für Zuhause | Windows
Microsoft 365-Features, mit denen Benutzende ihre Abonnements, Kontoeinstellungen und Abrechnungsinformationen verwalten können.
Can you go to https://account.live.com > Your info, make sure the language field is not blank or incorrect. Make sure you have it set up to the correct language. Review your country and region as well. Make sure they are correct. Then update your billing address again, and see if that helps.
As for the switching, did you cancel the montly plan first, and then try to sign up for the annual plan?
Any chance the monthly plan was signed up while you were in a different country? If so, this can be an issue. You would need to wait til it is expired, then update your profile country to match the country you live in now and to match the payment billing address's country, and then sign up for the annual plan. As long as you do it with the same account without leaving days and weeks of gap, your data will be intact.
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