Per the release notes, there were no changes to the cloud connector in 3.4.1, but there were changes in 3.4.2. As I said before, there have been some recent updates to the myopenHAB servers. I suspect that’s what did it.
Whatever the case, you’re not going to regain IFTTT support by rolling back to an older version of openHAB.
The quickest fix I can think of is to insert a third-party medium that works with both IFTTT and openHAB:
- Withings Sleep triggers IFTTT recipe
- IFTTT toggles MEDIUM
- MEDIUM updates openHAB
For example, a TP-Link Kasa/Tapo outlet would be an inexpensive medium.