APEX

First of all: Allright, probably I've been living too long under my comfortable 'Classic Developer' stone...

Anyway, here's the problem:

I've been following the articles presented by Adrian Png, Carsten Czarski, Mahmoud Rabie in order to get familiar with APEX Social Sign-In.

Database: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0

APEX 18.3

SQLDev/ORDS 18.3

Wallet and ACL has been taken care of.

Google Developer account should be good as well.

Maps is working correct, by the way.

API and Oauth2 are correctly set and have been verified.

I test both through apex.oracle.com as well as localhost (windoze).

Both are failing, and probably I'm missing something obvious, but not able to figure it out.

When comparing Mahmouds (thanks for sharing and explaining, Mahmoud!) file to mine, I'm not sure what i'm doing wrong but I have a feeling it should be pretty obvious for the APEX community.

Snip:

"

JSON POST https://www.googleapis.com/oauth2/v4/token request got HTTP status 401

Error: Null username passed to login procedure.

- additional_info: Contact your application administrator. Details about this incident are available via debug id "404"

"

What am I doing wrong, which part of the picture am I missing?

Thanks in advance for any pointer(s)!