Opening your spa...
Tap “Run auth tests”. Four checks run one after another — even if an earlier one fails — and each shows how long it took, exactly which address it contacted, whether any answer came back, and where it stopped. Then answer the few questions about your setup and tap “Copy results”. Nothing here loads the calendar or client information, and no passwords or tokens are shown or copied.
Please answer these before copying the results — they tell us whether something on the computer or network is blocking the connection.