If you just open link from notification it is video and it may take a while to play depending on your network. Often this fails for me as it’s just slow and not good for monitoring. This is all frigate and I suspect clip retrieval from HDD may also slow things to a crawl
If you have notification set to send the event snapshot, you will immediately get a snapshot from the triggering event. You may want to use this method and open video manually if needed
I have the same issue. Doesn’t seem to be a buffering issue since videos won’t play regardless of how long I wait for the video to load. I am able to view the videos manually from the home assistant media browser though so it doesn’t seem to be an issue of access. Still not sure what’s going on.