Thanks @Dipesh_Patel 
- I did a little digging on my end into the logs and can confirm it’s showing up as null when I replicate the query internally on my end too.
Out of curiosity, is your test shop using accelerated/dynamic checkout? It looks like it may be similar to this issue: Issue with buyerIdentity returning null
Let me know if deactivating accelerated checkout fixes this, or if you already have it deactivated/need to keep it activated and I can dig into this further for you - hope this helps a bit!