[BUG] redirect_uri doesn't match the client registered redirect_uri

Type of Connector

Independent Publisher Connector

Name of Connector

Power Automate - HubSpot CRM - Create a contact

Describe the bug

After adding the "HubSpot CRM - Create a contact" connector from power automate, then being redirected via pop up window to MSFT I authenticate sucessfully. Then after sucesfull authentication I get an error saying
"Couldn’t complete the connection
The redirect_uri doesn't match the client registered redirect_uri. Please contact the app developer."

Is this a security bug?

No, this is not a security bug

What is the severity of this bug?

Severity 2 - One or more important connector features are down

To Reproduce

• add the "HubSpot CRM - Create a contact" connector in power automate
• authenticate via pop up to HubSpot
• Error appears after successful authentication

Expected behavior

After successful authentication, the redirect should be redirected to a page that confirms successful log in and the connector in power automate is activated

Environment summary

Install Method - Choosing the connector via power automate
CLI version NA
OS version NA
Shell Type NA

Additional context

NA

Start by reproducing the HubSpot CRM - Create a contact authentication flow in Power Automate and inspect the connector's OAuth redirect configuration. Compare the redirect URI used after authentication with the client-registered URI; done means authentication completes and the connector is activated without the mismatch error.