Handsfree kit shows number 10000000 during a Bluetooth HFP session

I have installed an APP on my new Fairphone 3 which communicates with the handsfree kit of my navigation system via Bluetooth HFP. On the Fairphone 2 my mobile phone number was displayed in the NAVI during voice output. Now the NAVI shows the number 10000000 which leads to the fact that this is not recognized as an own phone number and creates each time an entry in the call list.

Does anyone know the problem and has a solution?

Thank you!

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