Issue Summary

When attempting to add a Single-Board Guest to another board within a Premium Workspace using the iOS app, users encounter an error message: "Sorry! An unexpected error occurred. Recent changes might be unsaved."

Steps to Reproduce

1. Create a Premium Workspace and ensure you are the Workspace Admin.
2. Within this workspace, create two separate boards.
3. Add a user to the first board as a "Single-Board Guest."
4. Using the iOS app, attempt to add the same user to the second board.

Expected Results

The user should be successfully added to the second board and automatically upgraded to a "Multi-Board Guest."

Actual Results

The user encounters an error message stating, "Sorry! An unexpected error occurred. Recent changes might be unsaved."

Workaround

Use the Trello on Desktop to add the user.