Cannot use Fenix 8 51mm Solar on calls.

I received today my Fenix 8 Solar 51mm but I cannot use it as a handsfree during calls. I enter my phone's BT settings, select Fenix solar 51mm enable calls and sound toggles but after a few seconds of displaying connecting finaly it cannot connect and disables the toggles...

Anyone having solved this issue? And this was one of the new features together with diving that I bought this watch, coming form a fenix 7SS...