Gemini Pro no longer able to use NotebookLM notebooks as a source (normal consumer Pro account)

Gemini API
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I am using a regular consumer Google account with Gemini Advanced (Pro, family plan). Until around mid-March 2026, I was able to use my NotebookLM notebooks as a source in Gemini chats and in custom Gems. It was not always perfect, but it basically worked: sometimes I got errors, but most of the time Gemini could access and use my NotebookLM content.

Since a few days, the integration seems to be completely broken for me:

  • When I start a new Gemini chat and attach a NotebookLM notebook as a source, Gemini either does not respond at all or responds as if there were no notebook attached.

  • When I try to use a NotebookLM notebook in a Gem, the Gem no longer appears to read from the notebook. It answers with generic model knowledge or does nothing, even for very simple questions that are clearly answered in the notebook.

  • NotebookLM itself is working fine. I can open my notebooks, chat inside NotebookLM, and get correct, grounded answers from the same sources. The problem only appears when Gemini is supposed to use NotebookLM as a source.

This used to work (with minor glitches) about two weeks ago, but now it has effectively stopped working entirely.

My setup:

  • Account type: regular personal Google account with Gemini Advanced (Pro, family plan)

  • NotebookLM: works normally when used directly

  • Gemini: works normally without NotebookLM, but fails as soon as a NotebookLM notebook is added as a source

From my perspective this looks like a regression in the Gemini ↔ NotebookLM integration on the server side, not a configuration or browser issue. It is also very similar to the “source blindness” / NotebookLM referencing bugs that other users have reported since the February 19 Gemini 3.1 Pro update.

Could you please:

  1. Confirm whether this is a known issue affecting consumer Pro accounts (not just Workspace)?

  2. Let us know if there is any current workaround (e.g., specific limits, smaller notebooks, switching model tier, etc.)?

  3. Provide an estimated timeline for a fix for NotebookLM as a data source in Gemini chats and Gems?

This integration is a key part of my workflow, so right now I have to fall back to working only inside NotebookLM and cannot reliably use Gemini with my notebooks.

Thank you for looking into this.

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Our company is also experiencing this issue. We purchased an Enterprise subscription specifically to use NotebookLM for analyzing meeting transcripts and presentations, and for building a knowledge base for our processes. It seemed like a perfect solution, so it’s a huge letdown that it’s currently not working.

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I am using this for academic research and the integration is not working at all for Gemini 3.1 Pro. Neither the pre-made NotebookLM Gemini chats on the left panel nor attaching NotebookLM directly in a new chat works. Gemini 3.1 Pro cites the correct sources in chat with a link to NotebookLM, but when clicked on there are no sources in the right hand source panel. The AI then hallucinates its own documents and tries to complete its task despite not having a source. This is very dangerous to the user who doesn’t double check everything they do because they have used this integration for a long time with no issues (paid subscribers). Please look into this devs!

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I’m here to reinforce that it is a severe limitation that was recently added to the workflows that involve the Gemini chat and sources concentrated in a notebook. I would like to request that this regression be resolved as soon as possible.

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I want to reinforce the criticality too. There are five options to integrate knowledge in Gems and this one, which in my opinion is the most powerful one, is not working. I was just about to invest time and energy in adoption with end users and had to admit that it’s not working. This is causing a really terrible perception by the end users. Thank you.