If your NotebookLM mobile app doesn't install at all, or if the language is not supported after installation, don't rush to think that your account is abnormal. Google's current NotebookLM mobile help is clearly written: the app is still rolling out, and your language and region may not be covered.
This is why you will see a very common phenomenon: others are already using NotebookLM normally on their mobile phones, but you can't find or install it, or the interface is much different from the other party. Many times it's not that the device is broken, but that the rollout is not a full opening in the first place.
Language is also a clear boundary. Google has a list of supported languages in its mobile help, and a special reminder that your language may not be available yet. The output language setting is also affected by this rollout, which is not a language that can be used on the desktop and must be supported simultaneously on the mobile phone.
Therefore, the order of the investigation should be changed like this:
1. Check if your system language and Google Account preferred language are on the current support list.
2. Double-check whether your region is within the scope of this mobile rollout.
3. If you are not satisfied, do not continue to load and unload repeatedly, and wait for it to be covered or cut to the desktop to be more realistic.
Another easy pitfall is to understand "NotebookLM web page can be used" as "mobile apps should also be available immediately". The two rollout rhythms are not exactly the same. The opening of the web page does not mean that the mobile terminal has also been given in full simultaneously.
In a word, the NotebookLM mobile app cannot be installed or the language is not supported, and many times it is not fixed, but the rollout has not yet arrived. Look at the region and language first, and then decide whether to continue tossing or not.
