The replacement monitor Service Tag now shows on the Service Tag website. From the shipping day of the replacement monitor, the external Service Tag website could take up to 10 business days before the replacement monitor Service Tag will appear.
I had a replacement monitor AW3423DW and it started to make cracking noises after a few days of usage. The issue is that the replacement monitor Service Tag doesn't seem to be recognize by Dell and the previous Service Tag warranty just stated as issue with Support Services. It had a 3 years warranty which was suppose to last till May 2025.  
Replacement AW3423DW Service Tag not found?