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that’s the thing I don’t. If I remove all the `withContext` and leave the `launch` as it is, and with the base context defined as Main + job it works just fine

Because you're probably using a library that originally returns a callback (with its own thread pool for running the request) and await seems to be adapting that callback using `suspendCallableCoroutine { }`, which will suspend until the callback is called. Then you don't need `withContext` at all.

launch does not block the main thread, that's why you don't get an exception

Not true if launch uses the Main dispatcher and you run blocking code on it...

For real blocking code withContext with IO or Default or custom dispatcher is needed.