We request two years' of access to transaction data when creating an account access consent but we only receive recent transactions.
I think this is because no "Next" link is included when a transaction page has zero transactions. Example requests and responses follow:
Account access consent:
First page transaction request:
Second page transaction request following the given Next link:
There are no further Next links so transactions older than 2019-12-09T14:05:57.274396 are not paged through.