Cannot deploy a Phoenix app

I’ve been considering fly.io for my new project.
However, I have tried deploying multiple times, and each time I got errors and failed to deploy.
Currently, I’m getting the below error. Please help.

=> ERROR [internal] load metadata for docker.io/hexpm/elixir:1.14.0-erlang-25.0.4-debian-bullseye-20210902-slim 4.8s
=> [internal] load metadata for Docker Hub 2.5s

[internal] load metadata for docker.io/hexpm/elixir:1.14.0-erlang-25.0.4-debian-bullseye-20210902-slim:


Error error building: failed to solve with frontend dockerfile.v0: failed to create LLB definition: docker.io/hexpm/elixir:1.14.0-erlang-25.0.4-debian-bullseye-20210902-slim: not found

I think they are having issues because I am experiencing issues as well

Error Post "https://api.fly.io/graphql": http2: server sent GOAWAY and closed the connection; LastStreamID=2147483647, ErrCode=NO_ERROR, debug=""