When the thing is value is from list of things please help

I have data type [group] with field [Invitation code(list of text)]
i have a button [join group] and [input, Invitation code]
what i want [when click the button add me on group members only when input is value is [i want make] code from groups codes .
How i do this

When button is clicked > Update Group’s members only when:

Group’s invitation code contains input’s value

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