Edit File from Document Library Not Working After Upgrade to WEBCON 2026

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After upgrading our environment to WEBCON BPS 2026, the “Edit file” functionality in document libraries no longer works as expected.

Before the upgrade:
• Clicking “Edit file” on a Word document from the document library opened the file directly in Microsoft Word for editing without issues.

After the upgrade:
• Clicking “Edit file” opens Microsoft Word.
• Entering the correct credentials does not authenticate successfully.
• Instead, the same login window reappears in a loop.

Additional Information
• Standard file download/open works correctly.
• Only Edit file is affected.
• This behavior started immediately after upgrading to 2026.
• The issue occurs for multiple users.

Question

Has anyone experienced this after upgrading to WEBCON 2026?
Are there any known changes regarding Office integration / WebDAV / authentication in 2026 that could cause this?

Any guidance would be appreciated.