There is an issue with MQTT integration that might affect your setup.
Previous version had a bug that erroneously allowed adding MQTT integrations even when over the platform limit for Basic license.
MQTT is considered a platform integration, therefore, only one platform can be used at a time with Basic license. If you already connected to another platform, like Home Assistant or OpenHAB, and added MQTT as well - MQTT integration will be disabled.
Platform limit applies only to enabled integrations, so you will be able to reenable MQTT after disabling the other platform integration in your setup.
Apologies for any inconvenience that may have caused you. Thank you.