Oracle ORDS HTTP/1.1 401 Unauthorized - oracle

Question

I am following this tutorial for Oracle Autonomous database by #ToddSharp : Microservices The Easy Way With ORDS And Micronaut
Under chapter "Testing your endpoint" I am curl the following:
curl -i -k \
--user [client_id]:[client_secret] \
--data "grant_type=client_credentials" \
https://[obfuscated]-demodb.adb.us-phoenix-1.oraclecloudapps.com/ords/usersvc/oauth/token
...with my own credentials.
When doing that I get the following response:
HTTP/1.1 401 Unauthorized
Date: Tue, 24 May 2022 20:19:28 GMT
Content-Type: application/problem+json
Content-Length: 193
Connection: keep-alive
{
"code": "Unauthorized",
"message": "Unauthorized",
"type": "tag:oracle.com,2020:error/Unauthorized",
"instance": "tag:oracle.com,2020:ecid/xxxxxxx"
}%
While I do understand the actual error, authorization, after a lot of testing I do not know how to fix it. I have tried for a couple of days now with limited success.
I believe the previous steps have been successful.
I would really appreciate some ideas and tips how to proceed.
UPDATE
I have tested a lot but still not sure I know what I am doing and is now curl to try to get some response:
curl -i -k \
--user xxxxxx..: yyyyyyy.. \
--data "grant_type=client_credentials" \
https://g9999999999-testdb.adb.eu-stockholm-1.oraclecloudapps.com/ords/usersvc/oauth/token
...and get the following response:
curl: (6) Could not resolve host: ntxNMkxxxxxx4iSRVDqE0w..
HTTP/1.1 404 Not Found
Date: Thu, 26 May 2022 22:07:07 GMT
Content-Type: application/problem+json
Content-Length: 182
Connection: keep-alive
{
"code": "NotFound",
"message": "Not Found",
"type": "tag:oracle.com,2020:error/NotFound",
"instance": "tag:oracle.com,2020:ecid/de999999999437c941e8cf6ffd8e8c"
}