The triumph Imponent IV under the marasenna lore is glitched. I have gotten all of the eggs in the harbingers seclude including the ascendant challenge. However, it has not counted those and I am stuck at 3 out of 5. I am very close to the curse breaker title and this is one of the things I need to get the title.
According to the API, you are missing 2 eggs in Harbinger's Seclude, but not the Ascendant Challenge ones.
See [url=https://www.d2checklist.com/2/RisenSpark/checklist]this link[/url] and click each link for the eggs (17 & 18) for more details.
If you are unable to find them, a video of each location would help Bungie in any investigation.
You are missing Eggs 17 and 18 from here:
https://lowlidev.com.au/destiny/maps/dreaming-city/1118029877?origin=d2checklist
Can you provide clips of yourself checking these areas?