Haven’t tried amber yet. I ordered a refurbished pixel. Soon ™

Where can I install Amber?

You can download from github, Go to release tab for all the download options. You can also use F-Droid. Btw, if you are using github, add it in your Obtainium for quick updates.

GitHub

GitHub - greenart7c3/Amber

Contribute to greenart7c3/Amber development by creating an account on GitHub.

Not if you're using Unified Push with ntfy for notifications. There seems to be a bug in #Amber that breaks UP Auth events for both Amethyst & 0xchat. The only way UP works for either is to disable Amber and sign in directly with nsec.

So that's why it doesn't work