Gemini 2.5 flas

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Hi,
i trie to use GEMINI which I have a subscription with our workgroup license or google.
I made a created API key and all. But your interface lets me choose only Gemini -2.5, but this model is, it seems, not available.
What can I do?

Google: This model models/gemini-2.5-flash is no longer available to new users. Please update your code to use models/gemini-3.6-flash for the latest features and improvements. We recommend you to use the Interactions API