If you are looking for the tickers offered by Oanda, it is indeed a pain to find as they do not have the tickers listed on the page with all their instruments for a direct link. I asked them a few months ago to create such a page, so will see how long that takes.

I did eventually find a page with the holiday hours and maintenance times which has the tickers and their associated times. You have to scroll through all the holidays to find all the tickers. Populate your Asset List with the tickers and then download the asset details via Zorro. Hope this helps!

https://www.oanda.com/rw-en/trading/holiday-hours-maintenance-times/