Strange DNS problem on Server 2022

I installed a new Server 2022 DC on my network as the only DC.  It serves DNS for our network and for a few weeks all has been working fine.  However, lately I have been having a problem using Outlook to access my secondary email address at comcast.net.  For long periods the attempt to download email fails.  I did some checking and found that when I do a nslookup on

imap.comcast.net I get this:

Non-authoritative answer:
Name: imap.comcast.net

(note, there are no IP addresses)

If I do the same but specify Google's DNS server (8.8.8.8) I get:

Non-authoritative answer:
Name: imap.ge.xfinity.com
Addresses: 2001:558:fc0a:3:f816:3eff:fea5:2243
2001:558:fc0a:3:f816:3eff:fe95:679f
2001:558:fc0a:3:f816:3eff:fe0c:7c51
2001:558:fc0a:3:f816:3eff:fe51:b939
2001:558:fc0a:3:f816:3eff:fee8:1979
2001:558:fc0a:3:f816:3eff:fe6b:52a6
2001:558:fc0a:3:f816:3eff:fe5d:49ac
2001:558:fc0a:3:f816:3eff:fe84:7ff1
2001:558:fc0a:3:f816:3eff:fef5:7c75
2001:558:fc0a:3:f816:3eff:fe8d:2a36
2001:558:fc0a:3:f816:3eff:fe57:df5e
2001:558:fc11:9:f816:3eff:fee9:ffd6
2001:558:fc11:9:f816:3eff:fedd:4bc5
2001:558:fc11:9:f816:3eff:fe40:d128
2001:558:fc11:9:f816:3eff:fec1:ef59
2001:558:fc11:9:f816:3eff:fe48:d86d
96.118.18.255
96.118.18.251
96.118.18.249
96.118.18.240
96.118.18.254
96.118.17.101
96.118.17.82
96.118.18.242
96.118.19.1
96.118.19.5
96.118.18.230
96.118.17.194
96.118.18.11
96.118.19.0
96.116.224.191
96.116.224.174
Aliases: imap.comcast.net