I use this a lot in my apps in both 6.7.1 and 6.8.0 without any problems.
Have you tried re-downloading the Community Commons module?
Maybe a 'Clean deployment directory'?
We are currently running into the same problem. How did you manage to solve the issue?
Same problem today on acceptance and production of the same app. The servers were running for a couple of weeks without problem and suddenly the async flow were not being executed anymore. It started on two different dates.
Running on Mendix cloud V3, using Mendix 7.23.8 and communitycommons v8.1.0.
The last sign of life of the async call is the debug log message:
DEBUG - CommunityCommons: [RunMicroflowAsyncInQueue] Scheduling task #20
A restart of the server fixed it for now, but it is a problem waiting to return. Reproducing this will be hard i assume.
Does anyone have any suggestions?