Okay, I understand the issue here. It’s similar to what we went through [here].(Multisite domains not working)
So you will need to add your subdomains to your hosts file manually in order for the DNS to route. We have a guide here with instructions for Windows and Mac: How to Edit Your Hosts File - Preview Site Before Updating DNS
Basically, you just need to find the lines that coincide with your multisite
127.0.0.1 multisite.local
127.0.0.1 www.multisite.local
::1 multisite.local
::1 www.multisite.local
Then add your subdomain beneath:
127.0.0.1 multisite.local
127.0.0.1 www.multisite.local
127.0.0.1 subdomain.multisite.local
::1 multisite.local
::1 www.multisite.local
::1 subdomain.multisite.local
After saving you should be able to navigate to that subdomain.
Sorry, I completely forgot about this aspect and was concentrating on the database issues. I have brought this to our developers’ attention again because it’s not really a smooth process. I’m hoping we can get it automated/simplified.