@Refinitiv.Workspace_064
Thank you for reaching out to us.
As far as I know, Datastream doesn't support intraday interval historical data and the intraday time series database on Refinitiv Data Platform only stores up to 1 year of history.
The solution that I can think of is LSEG Tick History REST API. Please kindly contact your LSEG account team or sales team directly to discuss any available solutions.