Mobile calling through Google mini

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I have been trying to setup my Google mini so I can make mobile calls through it.

The problem is everytime I get to the point in Google Home to input my number I get the following error message:

I have been trying to set this up for sometime without success. I have dealt with Telstra who advised it was a Google issue, so contacted Google who got me to check a number of settings before advising the problem is at Telstra end. Back with Telstra and I was advised it's all sorted and should be fine...but its NOT, I still can't connect my number in Google Home. Yes I have the latest version of Home and my Google mini firmware is also up to date.

Anyone have an suggestions to get me set up

Cheers

Dax