Message to contact group
It seems that contact groups not showing in message app, but showing only in mail app.
How can I send text message to a contact group?
iPhone XS, iOS 14
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You cannot add an entire Group (from Contacts) in a single go, in Messages.
You will have to add each individual (from the Group) to the conversation message ... to create group message. Once the group message is created, the group is then "fixed". And you can continue to message the group.
(Note: "fixed" ... but individuals might choose to leave the group, and even you can remove individuals from the group)
source: Send a group text message on your iPhone, iPad, or iPod touch - Apple Support