Hi DonFrag,
I suppose that other Third-Party plugins are outdated and it causes a conflict. In UE4 is a bug with detecting Google Play Services SDK version so you should set all Google Play Services and related (like Firebase) to 11.0.0.
If you use Ultimate Mobile Kit for Firebase integration you should update it to the newest version because it handles these changes.
Look that for it works so the problem is with other Third-Party plugins and their SDKs.
I still recommend you to do what I said before. Go to Project Settings -> Android -> Ant Verbosity and change to Verbose. Error logs will be more detailed and you will know what exactly causes the problem. You can try this on the copy of your project. Don’t give up! I can help you! ![]()