Hello Ansgar Eussner,
As suggested over the call, the charge the €129 might be for one service (e.g., Microsoft 365 Family or Personal), while the €5.60 monthly charge is for Business Basic—a different SKU.
Microsoft 365 Business Basic Pricing in France
- Monthly Subscription (Pay-as-you-go): €6.72 per user per month (excluding VAT)
Reference: https://www.microsoft.com/en-us/microsoft-365/p/microsoft-365-basic/cfq7ttc0ktxs/0009
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