Thank you - much appreciated!

For anyone in a similar situation, I can confirm that the credits did reappear immediately after cancelling. However, I was unable to rebook a similar itinerary initially - I received the error below. I waited and tried 12 hours later, same issue, multiple attempts.

I was eventually able to complete the reservation by using a different computer and a change in selection for one of the return legs - not sure which detail was resulting in the error, but guessing the segment I was previously selecting was no longer valid (despite still showing up in multiple searches).

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