When you use the Copy Link button from a calendar event and paste into iMessage, iMessage pulls in a preview image from a different event (oldest event in the calendar?).
Looks like iMessage uses a different User Agent to get previews and Elfsight might be returning the wrong OpenGraph metadata to that agent Messages showing old Link Preview … | Apple Developer Forums
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Hi there, @Kevin_Humphreys 
I’ve tried to send the link to one of your events through iMessage and there was no preview at all on my end:
I’ve additionally discussed it with the devs and they’ve confirmed, that previews aren’t supported there.
I hope this explains things.
In case the wrong preview still appears on your end, please send me its screenshot and specify the event name you’ve tried to send 
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Hi Max
Thanks for your response.
If I copy this link from the popup of an event:
https://www.victoriatruthcentre.org/events#calendar-0f38ffe4-36b3-4548-97af-88b02a835181-event-9ecc3301-7725-542e-bd25-adea4e4f2ce5
where the event image is this:
then when I paste that link into iMessage (on iPhone or on Mac) I get:
This “Candle Lighting” event image seems to be used as the preview for all event links.
It would be better to have no preview image than a wrong preview image.
Thanks for any help.
Kevin
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Hmm, that’s weird, but there is no preview for this link on my end 
Could you please specify the iOS version on your devices?
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Hmm.
I currently have iOS 18.4.1 and MacOS 15.4.1 but this has been happening for multiple people on multiple devices since I first set up the calendar.
Looks like on Mac you can Control-click on the preview to customize image options, but none of the options are for the current event.
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Thank you so much!
Please let me double-check it with dev team. I’ll update you tomorrow
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Thank you for waiting!
Our devs will investigate this issue further. I’ll report back once any news comes up