Invalid server certificate error

I subscribe to Scoutbook calendars, and these errors are happening repeatedly. Sometimes they go away for a while (a few days?) if I unsubscribe and resubscribe, but then they come right back. It’s driving me a little nuts because it pops up randomly on my phone. This is the error on my Mac calendar.
Screen Shot 2023-07-12 at 8.02.22 AM

Thank you!

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