Unable to add members to Blackmagic Cloud Project Library

I'm using DaVinci Resolve Studio 18.6.4 Build 6.
I have a Project Library in the Blackmagic Cloud, with myself as the sole member. When I click "Share" in the project manager in DaVinci Resolve, a web browser window opens with the URL `project-server.cloud.blackmagicdesign.com`. There I see a view similar to the project manager in the app, and when I try to share the project with any collaborator, I receive a message that says "Email <X> has not been registered", even though I've confirmed that the users have registered a Blackmagic Cloud account and verified their email address.
Notably, my experience with DaVinci Resolve Studio 18.6.4 does not match the "Getting Started With Blackmagic Cloud" tutorial on YouTube. In the YouTube video, clicking "Share" in the app opens a window in the app, rather than opening a new web page. Is that to be expected?
I have a Project Library in the Blackmagic Cloud, with myself as the sole member. When I click "Share" in the project manager in DaVinci Resolve, a web browser window opens with the URL `project-server.cloud.blackmagicdesign.com`. There I see a view similar to the project manager in the app, and when I try to share the project with any collaborator, I receive a message that says "Email <X> has not been registered", even though I've confirmed that the users have registered a Blackmagic Cloud account and verified their email address.
Notably, my experience with DaVinci Resolve Studio 18.6.4 does not match the "Getting Started With Blackmagic Cloud" tutorial on YouTube. In the YouTube video, clicking "Share" in the app opens a window in the app, rather than opening a new web page. Is that to be expected?