Sophos central login SMS is not received

I am the admin for my Sophos central company account,

I Can't access my Sophos central as I am not Reciving the SMS security code to my mobile, the number was not changed, its correct but I don't receive SMS when prompted to enter it

if I chose to use email verification, I receive it by email but the login screen requires a Pin code to be entered also, and I don't know it. 

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