One contact in group deferred to email address instead of phone number

[MiniNN]

All members of a group I text to have their deferred contact as phone number but one member's deferred contact method is email. I don't receive a "set as deferred number" when I long click on their phone number. Help please.

[oldfatfart]

Preferred or deferred?

[MiniNN]

Thankyou for responding to my post. I have finally changed the contact details for that contract person.