ICS Issue

[FMCN90]

I am hoping someone can help me.

I am creating a flow which links to a Form that offers 12 dates, these dates are all available for people to choose. Off the back of their choice I want an ICS invite to go out for all selected dates. I have created a very "complex" flow however when two or more dates are chosen the email is sent to that person but the ICS wont allow you to save both, only 1 the other is asking to be imported and I don't know why I'm really stuck. Any help is appreciated. thanks