PROBLEM
In some instances, attempting to open ArcGIS Pro in ArcGIS Online by selecting 'Open in ArcGIS Pro' on an item details page returns the warning message, 'A secure connection with this site cannot be verified. Would you still like to proceed?', as shown in the image below:
Depending on the cause, choose one of the methods provided to resolve the problem.
Add the ArcGIS Online website as a trusted site on the machine's internet browser
https://www.arcgis.com
Use HTTPS to access the ArcGIS Online organization
Ensure HTTPS is used in the URL to access the ArcGIS Online organization. Refer to FAQ: What do I need to know about HTTPS Only and ArcGIS? for the use of HTTPS in ArcGIS solutions.
Use the correct credentials to access ArcGIS Pro
Ensure the correct login information is used to sign in to ArcGIS Pro.
Make edits to specify the correct ArcGIS Online URL in the Registry Editor
Warning: Editing the Windows Registry requires administrator privileges on the machine and must only be done as a last resort. Backup the registry or machine before performing the steps below. Consult a qualified computer systems professional, if necessary. Esri is not liable for incorrect modifications following these instructions. User discretion is advised.
https://www.arcgis.com
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