Register Oauth2 applications

Follow the next link:
Microsoft Azure
Azure portal
+ New registration

OneDrive file picker

You need to register one more URL in order to use the OneDrive Javascript file picker:
And select both of these options:
And save the changes:
The next step is creating clientId and clientSecret:
Add new client secret
Unfortunately, the secret has an expiration, you're going to have to create a new one in 2 years:
Use the furthest date possible:
You will get a new secret, copy the Value into the clipboard:
This is the clientSecret, the Microsoft Secret ID is the Appmixer clientId. These secrets need to be added into the Backoffice:
And add new keys:
The clientId is the Application (client) ID from the main page:
Then go to the API permissions section:
Choose Microsoft Graph:
Delegated permissions:
Type-in Files:
And select these two:
Then type-in offline and select this permission:
The final set of permissions:
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Register Oauth2 applications