[BlueOnyx:25523] Strange DNS goings on

[Colin Jack]

We have customer’s IT guys having difficulty with CNAMES on our servers.

If they use something like dnschecker.org it doesn’t return any CNAME records. Returns all other records.

e.g 
autodiscover.flintevos.co.uk

If I look up https://dnschecker.org/cname-lookup.php?query=flintevos.co.uk&dns=google I get no result.
If however I use dig I get

colin at Colins-MacBook-Pro ~ % dig @8.8.8.8 autodiscover.flintevos.co.uk

; <<>> DiG 9.10.6 <<>> @8.8.8.8 autodiscover.flintevos.co.uk

;; ANSWER SECTION:
autodiscover.flintevos.co.uk. 3600 IN	CNAME	autodiscover.cloudplatform1.com.
autodiscover.cloudplatform1.com. 104 IN	A	51.140.78.157
autodiscover.cloudplatform1.com. 104 IN	A	51.140.253.155

Anybody any idea what's going on?

Thanks

Colin