I’m trying to use ILLiad and seeing an ‘Invalid session ID’ error.
Answer
Please clear your browser’s cookies and cache or open a private/incognito window and try again.
To quickly clear cookies and cache in Firefox, Chrome, or Edge, use the CTRL+SHIFT+DELETE buttons to bring up the 'Clear browsing data and cookies' menu, change the drop-down option from 'Last hour' to 'Everything' and make sure that both 'Cookies and site data' as well as 'Cached files' are checked.