AWS instructions for server setup with conda pytorch installation broken?

I am using an AWS p3 instance. I have setup my spot instances over the last few weeks with no problems using the following commands. These instructions are from
However, when I tried the following today

conda install -c pytorch pytorch-nightly cuda92
conda install -c fastai torchvision-nightly
conda install -c fastai fastai
``` I got the follow messages:

ubuntu@ip-172-31-41-201:~$ conda install -c pytorch-nightly cuda92
Solving environment: failed

CondaHTTPError: HTTP 404 NOT FOUND for url <>
Elapsed: 00:00.390095
CF-RAY: 47b31cd578956a31-LHR

The remote server could not find the noarch directory for the
requested channel with url:

As of conda 4.3, a valid channel must contain a `noarch/repodata.json` and
associated `noarch/repodata.json.bz2` file, even if `noarch/repodata.json` is
empty. please request that the channel administrator create
`noarch/repodata.json` and associated `noarch/repodata.json.bz2` files.
$ mkdir noarch
$ echo '{}' > noarch/repodata.json
$ bzip2 -k noarch/repodata.json

You will need to adjust your conda configuration to proceed.
Use `conda config --show channels` to view your configuration's current state.
Further configuration help can be found at <>.

Does anyone know what is wrong please?