Ok, very thanks for your help!
I was generated (badly) many address book as many address group;
the correct way was to import into a only one address book and create and associate instead specific contacts to its group.
thanks
What does 'CQ' at the end of my e-mail address stand for ?
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OK thanks, it’s the hash
But is CQ an acronym for something ?
https://en.wikipedia.org/wiki/CQ -
@acu It’s the base64-encoded Java hashCode of the address book URL.