M365 Product Key not working (country mismatch) while actually things should work

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MS customer support suggest me posting the following issue here:


I have a Microsoft account set for region Germany.


I have bought an original retail code for M365 to extend the subscription.

The code is for Germany and comes in the sealed original box.


The system however claims a country mismatch and stops with an error message like:

Fehlercode: ConversionBlockedCurrencyCountryMismatch
Korrelations-ID: 5e209170-4130-4880-a7f5-8b4fdd9d4299
Any suggestions to still fix it?


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