Hi! Here are a few suggestions that might be able to help you out!

One Quest at a Time Limitation
You can only undertake one quest at a time across all your Grail horses, including Caradoc. If another Grail horse is currently on a quest, Caradoc won't be able to start a new one until the existing quest is completed.

Quest Completion Not Registering
If you've completed the first quest multiple times without progressing, it's possible that the completion isn't registering correctly. This could be due to a visual bug or a temporary glitch. Some players have reported similar issues where quests don't progress or complete as expected.

Refresh or Re-login: Try logging out and back into your account or refreshing the game page to see if the quest status updates.
Clear Cache: Clearing your browser's cache can sometimes resolve display issues.
Check for Other Active Quests: Ensure no other Grail horses are on quests, as this would prevent Caradoc from starting a new one.

Contact Support
If the issue persists after trying the above steps, consider reaching out to Howrse support for assistance. They can provide specific guidance or address any underlying issues with your account.

Thanks Dauntless, appreciate your help, I'll give them all a go He's my only Grail horse so I think it might be a support issue

Hey,
I'm not sure whether I interpreted the question right. If the question is, why you can't do any other quest than the one for the HoP, it's because: Every unique Grail divine unlocks its own quest and reduces the points needed to complete the others. (duplicates don't do anything)

Ohhh I see! That makes sense thank you