I currently have this same issue. Apple Watch Series 5. Called support 3 times now and been on phone for hours with no solution. Watch has been hard set on TMO end and paired to my digits line. Still get error code 406. It is not paired to any other device and just got a new phone as well and has the same issue. Someone needs to fix this. An LTE watch is useless on TMO if it cannot be paired.
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