Why my Volvo XC70 rear wheels not spining at all in off road?

Q: I noticed there is no movement at all from the rear wheels when it comes to off road road such as slippery uphill. The only wheels moved were the front one???? The front tyres get worn out much more quicker than the rear. Also, today I got stuck reversing on a slope, and got help from a someone's car with a rope. Overall, do you think my AWD system is not working? Please explain. Thanks In response to Rudy H. Indeed I noticed the little triangle sign and it looks like a slippery road sign.

A: AWD can work in the strangest ways....theres a ratio between the 2,somthing like 30% rear and 70% front wheel drive...its all down to how the differential is set up....

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