No cellular signal on the base station

Hello, I live in France and I am in a trial period for the protect plus plan.

I am coming here because my base station says that my alarm has no cell signal. When I look at the network settings there is an access provider mentioned but the cellular capacity icon is in red.

I would like to contact the French customer service but the number 00 800 87 00 97 81 does not work either. The operator tells me that the number does not exist.
Can you help me?
Thank you very much for your help.

Translated with DeepL Translate: The world's most accurate translator (free version)

Hi @Martipit. When calling the number, are you calling from a Landline or Cellular phone? As mentioned on this page here, the number is designed to be used with a landline and does not work with some mobile carriers. Let me know if this is the case.