I am having issues with using a group calendar outside Zoho ( public ICS). I need to let employees subscribe to it in their email software read-only so that they are aware of upcoming events (so no adding them to the group, which would grant them writing permissions). Additionally, I want to display this ICS feed in a WordPress plugin on our website.

The WordPress plugin worked fine for maybe less than a year; however, recently, it stopped downloading events for some days, and, presently, only Wednesdays and Thursdays are synced. This forced us to use Zoho's iframe embed instead, which is suboptimal. Initially, I thought the WordPress plugin was having issues; however, when setting up read-only calendar access for an employee, I found out that it glitches the same way there, as well, so something is wrong with the ICS feed. Users who are in the group can access the calendar on Zoho just fine; only the public ICS link does not display all events.

Any help will be much appreciated!