Unable to scrape URL when migrating from Substack

Hello!

I’m trying to migrate from Substack. I’m on a MBP running macOS Big Sur. I did:

npm install --global @tryghost/migrate

Then ran:

migrate substack --url --readPosts --email --drafts false

And I’m getting:

:heavy_check_mark: Initialising
:heavy_check_mark: Read csv file
❯ Fetch missing data via WebScraper
:heavy_multiplication_x: 01/89: [URL_X] - Unable to scrape URL [URL_X]
:heavy_multiplication_x: 02/89: [URL_Y] - Unable to scrape URL [URL_Y]
:heavy_multiplication_x: 03/89: [URL_Z] - Unable to scrape URL [URL_Z]
etc

Thank you in advance for any help.