Not sure if this has anything to do with this specific “Not enough space” issue, but keep in mind that you need to follow the recommended upgrade path as outlined here: https://tasmota.github.io/docs/Upgrading/#upgrade-flow
Hello
It was the 9.5 bin file. What I’ve tried is switching back to 8.5.1 which seems to have worked. In 9.5 the MQTT integration / communication seems to be broken.
The traditional way that Tasmota has worked with Home Assistant is via Home Assistant’s MQTT Discovery. Tasmota has deprecated this method in favor of their own technique which requires the use of the Tasmota integration in Home Assistant. In the future, they will eliminate support for MQTT Discovery entirely.