Upload the Certificate into the App Registration
After you have exported the certificate from the key vault, you need to upload it into the app registration.
Select App Registrations.
Tip
Alternatively, use the global search to look for App Registrations.
The App registrations page opens with the Owned applications tab activated by default.
Select the app registration from the list which you have created for PoolParty for SharePoint application.
You are on the application Overview page.
Select Certificates & secrets from the menu on the left.
In the Certificates tab, select Upload certificate.
The Upload a certificate page opens.
Upload the certificate from your device.
Provide description.
Confirm with Add.