It seems the Auction House API has stopped updating for the EU realms since a few hours (some realms stopped updating since about 2019-08-24 18:30 UTC (case: Draenor), others seem to have had an interruption around that time, recovered for one or two cycles, and then broke down again around 2019-08-24 22:20 UTC (case: Arathor, Nordrassil, Stormrage).
Looking at @Erorus’ excellent diagnostic site https: // does.theapi.work/ confirms that the problem seems to be on Blizzard’s side (sorry for breaking that link, these new forums don’t allow links).
Note that I don’t get errors, the data just has stopped updating (I guess that means there is a problem in the systems that feed the data to the API)