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Click "New registration".
Give the registration a name (this is for your own information only, something like "InTimeMailClient"), choose "Accounts in this organisational directory only" and in the Redirect URI box, select "Web" and add the following redirect URI: https://<your-intime-domain-here>/oauth2Client/callback/Email-Client
Click Save. Make a note of the Application (client) ID and the Directory (tenant) ID (should be the same as noted earlier).
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