Hey @Jorge_Zuniga some customers have been successfully using firebase-admin, I know that v10.0.2 works and you can try more recent versions of it (e.g. v10.x.y).
I’d recommend testing that out and see if that works for you and let us know if you see specific errors. We are able to circumvent the node version requirement because our runtime is custom. The v10 referenced in our docs is more about us guaranteeing that v10 API is largely supported but it’s tricky been able to identify which other features from later versions are supported and which ones are not yet.
While I understand this can make things confusing we are working internally to iron that out and make sure it is more intuitive understanding what can work and what doesn’t. Additionally we plan on identifying the gaps preventing us from officially provide large support for later versions.
That said, let me know how your test goes!