The Google Assistant integration we have is the one on the phone. Basically when you press flic then the voice assistant on the phone will open up and begin listening for a voice command.
Google Home does not allow third party triggers in their ecosystem (yet). They were planning to add support for buttons some year ago but for some reasons dropped those plans. Maybe because they want people to use their voice, I don't know.
We have direct integration with IKEA Trådfri and their Sonos speakers. Deltaco is white labelled Tuya SmartLife devices, so I guess you can use them through IFTTT.
Not sure but try to remove the buttons from the Flic app and add them back. It's important that you have an active internet connection while adding the button and configuring Alexa in the Flic app, since that sends a signal to our backend that the Alexa action is used for this button on your account or hub.
The IR device consists of a transmitter and a receiver, which are separate.
If you can record signals in the IR provider in our app but your device does not react when played back, and you have tried this for multiple devices, it might be that either the hub pcb or ir accessory has become broken.
@paul-mckibbin Our Alexa integration is a cloud to cloud integration. After you have set up Alexa, you could theoretically throw out the Alexa device through the window and uninstall the Alexa app and it should continue to work, assuming you have set up Alexa to perform another cloud action (initiated by Alexa cloud)...
So I can't understand why the app version in your phone is important.