Cannot subscribe to calendars from two accounts in Thunderbird Lightning?

We would like users to be able to have calendars in two accounts--a personal one, and a companywide one for common events.

I created both accounts, and after subscribing to my personal calendar, I tried to subscribe to the company one. However, as you subscribe to it in Thunderbird, it is unchecked and grayed-out. I am never offered the chance to enter a password.

I thought this was strange but decided to test it on a second computer. There, I subscribed to the company calendar, and it worked! But then, when I tried to subscribe to my personal calendar, I got the same result as for the company calendar on the other computer: the calendar instantly unchecks itself and will not display.

The message in the error console is:
[calCachedCalendar] replay action failed: null, uri= https://calendar.zoho.com/caldav/67bec26b457998b7f4ff3aa462e24fdbde3fc8efc8d02811c461741fc9e90bb99cae46c3a4588ad05678a25ae599d81f/events, result=2147500037, operation=[xpconnect wrapped calIOperation]

So it seems like calendars from the first account which are added work, but those from a second account do not? I do have the "calendar.network.multirealm" setting in the config editor set to true. Is there any way I can get calendars from two Zoho accounts to show in the same Thunderbird Lightning at the same time?

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