Solution –
LOG IN to your Caltrics account
‘Mouse over’ your logged in account name and click/tap MY ACCOUNT
Click/tap ‘Connect my calendar app‘
This will open a new webpage, listing instructions how to connect calendar apps to your Caltrics account. Scroll down and near the bottom of the webpage you will find your webcal ics URL (format is webcal://c.caltrics.com/ followed by a unique identifier nnnn9999-nn99-99nn-99nn-999999xxxxxx)
Copy the webcal URL using ‘Copy link address‘ (if you just ‘Copy’ the URL, ensure that you copy the exact URL with no leading or trailing spaces).