In some cases, payments for over £1000 are getting rejected by the Bank due to the user having reached their daily limit, even if those limits have not been reached.
TrueLayer has reported this to the bank, who has found an issue on their side and will release a fix on the 20th of June.
We will report here once further information is available.
If you need more information
Check out this FAQ article with more details about the daily limits for the RBS Group