Solution
We add another "user" to the Hunt Group(s)...this time a virtual extension DID which will remain on Cisco, not pointed to the MS Teams Enterprise Trunk, which will keep at least a portion of the call "on platform" as the Hunt Group tries to connect with a Teams user in the Hunt Group
*To ensure all unanswered calls return to the voicemail box of the Hunt Group, the number or rings (seconds) before the call goes to voicemail will need to be LOWER than the Redirect to Voicemail rules setup for each user on their Teams application.