Hi ​@hclackSWH, welcome to the Box Community!

We’ll look into the issue further. Could you please share the exact error message you’re seeing when trying to add an external user to a hub? Also, does the error occur with other external users, or is it limited to this specific email address?

Thanks so much — we look forward to hearing from you! 

Thanks for the warm welcome! I have attached three screenshots, any email address used.

Hello ​@hclackSWH, much appreciated, and thank you for sharing the screenshot of what you're seeing on your end. The Hub settings appear to be properly configured.

As a next step, could you please check the collaboration invite settings within your Enterprise settings (not the Hub) to ensure that external collaboration isn’t restricted? Additionally, as part of the troubleshooting process, please review the folder-level settings in the specific Hub to confirm that there are no restrictions on collaboration invites. In some cases, limitations may be applied at the folder level.

If everything checks out and you're still unable to send invites, we recommend submitting a ticket so our Product Support team can take a closer look.

Thanks again for your patience as we work to resolve this!