So, I've tried Live chat with eBay today, 4th July 2022, and he was able to provide me a link that works.
Please try this.
Existing link that does not work: https://www.ebay.com.au/help/buying/bidding/retracting-bid?id=4013
This link should work to retract a bid: https://www.ebay.com/bfl/RetractBid
