I've made similar flows many times without issues. I need to use select and initialize variable to create a string of email addresses from a multi-person field in Sharepoint to add as recipients in an email. Below is how I normally do it without issue:

However, my most recent flow is adding an apply to each on the Select data operation, which doesn't allow me to use the output in Initialize variable.

Do you have any recommendations on a better way to do this or to get the apply to each gone on the select data operation?