Issue Summary

If a single-board guest and a member who will become a multi-board guest are added to a board at the same time, the multi-board guest warning message does not appear and the multi-board guest is added without any warning about billing adjustments.

Steps to Reproduce

1. Ensure that there is an existing single-board guest in the Workspace
2. Navigate to a board
3. Click on the 'Share' button at the top menu
4. Type in an email address of a new single-board guest, and an email address of an existing single-board guest
5. Click on 'Share'

Expected Results

A warning prompt should appear advising the Workspace admin that their billing will be adjusted.

Actual Results

Billing is automatically adjusted, and the existing single-board guest becomes a multi-board guest.
Both members are added to the board without a warning prompt.

Workaround

Share the board with one member at a time, or review the Workspace members > Guests page to view the list of existing single-board guests so Workspace admins are aware of their current Guest list.