I had upgraded to the latest version of ionic and so I follow the step in dashboard.
I started to connect to ionic pro by
ionic link --pro-id {my app id}
I followed the step to generate a new ssh key under my .ssh folder and it created mypath.ssh\ionic with anonymous and anonymous.pub.
And then I followed “Push your code up to the dashboard!” by enter
git push ionic master
It showed
fatal: 'ionic' does not appear to be a git repository
fatal: Could not read from remote repository.
So I googled and find out that
https://forum.ionicframework.com/t/ionic-pro-ionic-does-not-appear-to-be-a-git-repository/104089/32
I followed jaydz advice and run the command
git clone git@git.ionicjs.com:ssing1221/myProject.git
or
git push git@git.ionicjs.com:ssing1221/myProject.git
They all showed
The authenticity of host 'git.ionicjs.com (54.68.22.76)' can't be established.
Permission denied (publickey).
So I googled it again and found out that this is a ssh key problem
And I already generated my ssh key by
ssh-keygen -t rsa -C "your_email@example.com"
So right now how can I put my key id_rsa.pub, to ionic pro for the connection?
Thanks! 
try to generate ssh-keygen in git bash not in cmd in your root folder
Thanks for the reply.
I generated the key in git bash but where I put my key for ionic pro connection?
under .ssh folder? or under ionic project directory?
Thanks again
in your project directory
I tried your suggestion. Run the keygen command under my project directory by using git bash.
And then I run
git push git@git.ionicjs.com:ssing1221/myProject.git
And the result is
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
After many attempts, I want to give up to use ionic pro now. 
Anyway thanks for your help
have you commit your repository to git first ?
Yes. I already use the github before using ionic pro.
I just wonder why after the auto generation of ssh key
it shows
Request: POST https://api.ionicjs.com/users/undefined/sshkeys
Response: 404
Body:
{ link: null, type: 'NotFound', message: '404: Not Found' }
It supposes to send my key to ionic serve but it cannot.
according to your response ,i think you forgot to link your project with your git repo.
what is your
git status
responce ?
I had followed the video. But failed after keygen
I already linked to my git repo
>git status
On branch master
Your branch is up-to-date with 'origin/master'.
nothing to commit, working tree clean
Thanks all the suggestion you guys even I said give up 
ok, what external GIT service are your using?
I’m using gitlab.com
it’s really important to get the keys setup for your git provider and ionic pro.
these are my noted i keep in SImpleNote.app (free great notes app 
--First Time----
$sudo npm install -g ionic@latest
$ ionic link
Automatically setup new a SSH key pair for ionic
create a new app
$ git push ionic master (ionic-pro)
- git commit to ionic servers
- builds
--When pushing builds
$ git status (gitlab.com)
$ git add -p (gitlab.com)
y to confirm
$ git commit -m 'change desc' (gitlab.com)
$ git push (gitlab.com)
I use github
I thought ionic link will help me to setup a ssh key but it seems not.
when i do git push ionc master i get
fatal: Invalid Ionic app repository. user_name/project_name.git
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
ok, just want to make sure that you realize ionic pro is not a GIT repository.
when you do the setup you are giving access to Ionic pro to access your repository.
i use gitlab but should be same as all
before you do
$ ionic link
you need to make sure your key is setup between you and your GIT provider
yous should be able do these command
$ git status (gitlab.com)
$ git add -p (gitlab.com)
y to confirm
$ git commit -m 'change desc' (gitlab.com)
$ git push (gitlab.com)
now you can do
$ ionic link
then when linked...
$git push ionic master (ionic-pro)
hope this helps clarify
i use github and i’ve been pushing in it for more than a month. i did ionic link and it was successful. but when i do git push ionic master i get that error. same prob on mac and win
what happens when you run
$ ionic link (must be in your app folder)
wow, i follow the second video at https://ionicframework.com/docs/pro/basics/getting-started/ to a T and had no issues. (i sighed of for Gitlab because he used it)
have you run?
$ ionic doctor check
and cleared any issues
ran $ ionic doctor check
issues renegading angular update and ios 11 viewport.
still same pob