@richard.teale

Australian Stock Exchange RICs that start with "IPO-" like IPO-GRA.AX are pre-IPO RICs. They are created in anticipation of a company's IPO and allow to retrieve some fundamental & reference data for the company prior to the IPO. These RICs do not exist on the Refinitiv Real-Time Datafeed or in the timeseries database. This is why you get the error when you try retrieving timeseries metadata for these RICs. Once the IPO is complete and the stock begins trading on the exchange, pre-IPO RIC will be replaced with the regular stock RIC (for IPO-GRA.AX it will be GRA.AX). At that point you will be able to retrieve streaming market data, timeseries and timeseries metadata for the stock using the regular RIC.
M2M.AX RIC refers to the stock of MT Malcolm Mines NL, which is a public unlisted company. This stock is not listed on any exchange and for this reason the RIC M2M.AX does not exist on Refinitiv Real-Time Datafeed or in the timeseries database. This is why you get the error when trying to retrieve timeseries metadata.
DBO.AX refers to the share of Diablo Resources Ltd., which is also not listed on any exchange. Diablo Resources Ltd. just registered prospectus for a share offer with Australian Securities and Investments Commission. According to the prospectus, the company intends to list its shares on ASX, but at this point they're not even at the pre-IPO stage. The bottom line is that this stock is not listed, and the RIC does not exist on Refinitiv Real-Time Datafeed or in the timeseries database. This is why you get the error when trying to retrieve timeseries metadata.