If you are new to using connecting to Dynamics 365 using OAuth 2.0, here’s an Auth URL you’ll need for your external applications / Postman testing of Web APIs in Dynamics 365 CRM.

URL for OAuth2.0 for Dynamics 365 CRM

The URL is: https://login.microsoftonline.com/common/oauth2/authorize?resource=[URL of the D365 Environment]

In the square brackets, you can put the URL of your Dynamics 365 CRM environment itself like shown below –

And then the URL should be: https://login.microsoftonline.com/common/oauth2/authorize?resource=https://cft158.crm.dynamics.com/

Hope this was helpful! Here are some more Dynamics 365 posts which you might be interested in –

1. Dynamics 365 Storage Utilization | Dataverse Storage | Power Platform Admin Center
2. Use Hierarchy in Roll Up Fields in Dynamics 365 CRM
3. Filter records in a View owned by a Team you are a member of | Dynamics 365 CRM
4. Get GUID of the current View in Dynamics 365 CRM JS from ribbon button | Ribbon Workbench
5. Dynamics 365 App For Outlook missing on SiteMap in CRM? Use shortcut link [Quick Tip]
6. Import lookup referencing records together in Dynamics 365 CRM | [Linking related entity data during Excel Import]
7. Mailbox Alerts Hide/Show behavior in Dynamics 365 CRM
8. Excel Importing Notes (Annotation) entity in Dynamics 365 CRM
9. Enable/Disable the need to Approve Email for Mailboxes in Dynamics 365 CRM CE
10. Call Azure Function from Dynamics 365 CRM using Webhooks
11. Show Ribbon button only on record selection in Dynamics CRM
12. Accessing multiple occurrences of a field in Business Process Flow using JS in D365 CRM

Thank you!!