Hi there. I was struggling with the same issue. I finally found this walkthrough, and it worked! I hope it helps someone else out too.Step 1: Create the subdomain for your customer account pagesFrom your Shopify admin, go to Settings > Customer accou...

Thanks, I haven't checked it again but hopefully the issue is resolved now. We use UPS pickup all the time and never had this issue so I'm sure it's a glitch. 

Is anyone else having issues scheduling a UPS pick up. When I try I get error "Available pickup dates were not found: An unexpected error occurred" Is this something with Shopify?

I found a solution here: How to set up custom and personalized products on Shopify (free) - YouTube.Hope it helps you as well!

I have the same issue. Hopefully, someone could help resolve this for us. 