Firebase has strict requirements for User Property names; they must:
Begin with a letter (not a number or symbol, including an underscore)
Contain only alphanumeric characters and underscores
Be no longer than 40 characters
User Property values must be fewer than 100 characters.
The issue is we are not mapping the dash symbol to something else. This prevent Firebase to log any element with a dash symbol in it.
From Segment documentation
The issue is we are not mapping the dash symbol to something else. This prevent Firebase to log any element with a dash symbol in it.