Anyone else seeing this ArcGIS Sign In Pretty-print {"currentVersion":"2026.1"} window?

Question

This window pop-ups during ArcGIS Pro startup (in both 3.6, and 3.7). It requires checking "Pretty-print' and closing before initialization continues. It also appears in the Portals area.
Any suggestions on what it is and how to get rid of it is appreciated -- thank you.

ThierryLegrain · Answer

Thanks Cody that gives me somewhere to look.

I am the only one in my org. This issue does appear to be Portal related. 
If the active, previously signed in portal is mine then I get this message during initialization.
If the active, previously signed in portal is from a large organization (which I work for); I don't get this message.
If I sign out of all portals and then restart Pro, I get this message when I click Settings (which goes to the About page) not during initialization.

CodyPatterson · Answer

Hey @ThierryLegrain

From what I'm seeing, it's possible that your admin or someone controlling the Portal URL may have set it to return JSON, as the response you sent is JSON formatted.

I'm wondering if it's related to something like this: https://community.esri.com/t5/arcgis-enterprise-portal-questions/customize-enterprise-portal-site-login/td-p/1293456

Anyone else in your org having this problem?

Cody