Hey all, I have a somewhat complicated flow I'm working on which I hope someone smarter can help me figure out!
In short, I'm not sure if my approach is the most efficient and I'm not sure why we keep getting "update the child for for action Run_a_Child_flow to end with a response action" error (chatGPT hasn't been the most helpful so begging for help here instead!).
We have a Microsoft Form setup that allows users to check for a number of sites they want to visit (similar to below where they can check which site):

x Site 1
x Site 2
x Site 3
We then have a flow (deployed within a solution just for visiting) that uses a form trigger, to initialize a bunch of variables, then set them (they submit the form, it triggers and we work off the form elements):

Set vars:

All of that seems to be fine, but what we need is for the Flow to use the varSiteSelection variable to determine which site was checked on the form, then send all of the form vars to a child flow so it can trigger a separate approval automation (this is because each site has its own set of approvers and visiting coordinators): -- there's 18 total selections/variables to pass:
I'm using an Apply to Each that uses the varSiteSelection with a switch and case (to match the name of that site on the microsoft form), which should be the correct method to loop through the sites and pass the vars to a child flow setup for each site (basically the name matches, it triggers a child flow for that site?).

However, when I attempt to save it, I get this message that I'm "missing a response action"

** I've done a fair bit of research into this and most people seem to fix it by modifying the connections in "Manage run-only permissions" for the child flow but this didn't fix the issue for me (Workflow cannot be used as a child workflow becaus... - Power Platform Community (microsoft.com):

** there's a few more connectors but all are set to use the connection with my company e-mail -- that's the only option I have in the selection box., other than "provided by run only user".
I also tried adding a "Respond to PowerApp or flow" which is apparently a fix for some people, but wasn't sure how to configure it and didn't work (no errors for it, just didn't solve the original "Update the child flow for action 'Run_a_Child_Flow' to end with a response action." error.

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Bit of a convoluted issue but maybe someone has some insights. Our end-goal is simply to 1) have a user fill out a form, 2) if they check 1-site or 10-sites, route all the form information to a child flow that corresponds to that site, then the child flow will run an approval automation in teams based off the form data (variables) we passed.
Any help is greatly appreciated! Both the flows are in a solution together and they can connect through Run a Child Flow.