I have an issue with Client ID and OAuth code

I used R package to query ORCID. A week ago I was able to query and also ran employment with ORCID. It seems something went wrong that now I even have issue with my client ID.

I read README.md at https://github.com/ORCID/ORCID-Source/tree/development/orcid-api-web

1. I tested my client ID with this curl command1
   https://sandbox.orcid.org/oauth/authorize?client_id=APP-56WL1F7H14FSAJT6&response_type=code&scope=/authenticate&redirect_uri=https://developers.google.com/oauthplayground

Response is "Error: The provided client id APP-56WL1F7H14FSAJT6 is invalid.".

2. I also test another command 2.

curl -i -d 'client_id=APP-56WL1F7H14FSAJT6' -d 'client_secret={} -d 'scope=/read-public' -d 'grant_type=client_credentials' 'https://www.orcid.org/oauth/token'

I got a response of "{"error":"invalid_client","error_description":"Client not found: APP-56WL1F7H14FSAJT6"}(base)"

3. I logged into my ORCID and test this
   https://orcid.org/oauth/authorize?client_id=APP-56WL1F7H14FSAJT6&response_type=code&scope=/authenticate&redirect_uri=https://www.orcid.org/
   Response: "UA Scholary Dataset has asked for the following access to your ORCID record."

So based on response from command1, my client ID is not working on sandbox??
For 3, it is somehow working.

I am confused with all these responses. The code was working one week ago and now everything is not working right. I assume either my client_id, client_secret, or ORCID_TOKEN is not working right. Any help will be much appreciated!