Hello @Kenyon_Hackett
Just use some basic functions with your variable.
{{replace(+123456789; "+"; emptystring)}}
https://www.make.com/en/help/functions/string-functions#replace--text--search-string--replacement-string-
For more knowledge:
I recommend that you check out the official free course at Make Academy. It’s worth it if you want to learn more about Make in detail.
If you’re just using copy/paste and you don’t know about the syntax of Make’s functions then why you’ve not copied the full things that I’ve posted?
Using of functions looks like this.
That’s why I’ve also added a reference link about how to get started with Make.